The following list has a number of commonly accepted "high-fantasy" sayings, swearwords, greetings and farewells. Feel free to make up your own; please just make them believable, and avoid real-life swear words.

SWEARING
General exclamations

“By the hells!”
“Hellfire!”
“By the fiery gates of the Abyss!”
“Gods above 'n' fiends below!”
“Shyte!” [Generally seen as a better variant of “e”]
“Damn / Damnation!”

Personal abuse - men

“Whoreson” [questions someone's parentage, but a general term of abuse]
“Knave”
“Orcwit” [fool, idiot]
“Orcsnack” [a green recruit]
“Badblood” [a troublemaker]

Personal abuse - women

“She-goat”
“Harpy”
“Harlot”

RACIAL SPEECH
Orcish

“Someday I will kill you” [a standard Orcish greeting]
“Not today” [the standard reply]

“Where there's a whip, there's a way.”
“It is a good day to kill”
“Elfson”

Dwarven

“Axe high, friend, I go” [Dwarven farewell]
“May your axe be ever bright” [Dwarven farewell]

"orc-filth" [Abusive term.]
“By my beard!” [The speaker is being VERY serious.]
“His beard is long.” or “…longer than his years.” [indicates wisdom]
“no-beard” or “shorthair” [meant as an insult to any race; particularly grave to another dwarf]
“You stand tall among us.” [complimentary; the actual height of the person in question is irrelevant - it's impossible for a dwarf to use this ironically.]
“His axe is sharp.” [said of a good strategic thinker.]
“Under the Mountain.” [Safe, well protected.]
“Open to the sky.” [Unsafe, unprotected. Also an insult, i.e. someone is a liability.]
“Sandstone!” [Serious exclamation; literally stone too soft and crumbling to be workable.]

Elven

“Winds blow.” [A neutral elven greeting indicating that chance has brought you together.]
“Sweet water and light laughter until next” [elven farewell]
“I/we leave you” [Drow *only*]

“Feast of wolves” [i.e. a slain enemy]
“Gate bird” [i.e. a slain enemy]
“Go kiss an orc”
“Listen to my laughter” [dismissive]
“Much wind pours from your mouth”
“Son of snakes” [i.e. a dishonest person]
“You are king in your imagination” […to a pompous person]
“You smell like a human”
“Your head is empty”

Gnomish

“Forges warm, friend” [Gnomish farewell]

“(to) set the gears in motion.” [Getting things started, often with the mechanistic gnomish mentality that all things work like machines.]
“(he) always casts a shadow.” [Mild or medium insult. Suggestive of the inability to hide *in* the shadows or use illusions to avoid detection.]

Halfling

“Good morning, and good day after that! Don't let anything curl your hair!” [Halfling greeting, to which is sometimes added, “'Ware the Big Folk, and mind the goblins too!”]
“Gods smile (upon you)!” [Halfling greeting to the impatient other races.]

GREETINGS and SAYINGS
Hello and goodbye

“Well met” [Most often used greeting, especially between races or to those about whom you are unsure.]
“Well again” [Used between business associates or acquaintances]
“Again.” [Hostile greeting. Abbreviated from “Well again.”]
“Until swords part” [Warriors' farewell throughout the Realms.]
“Until next, may your sword be ever wet, and your arse dry” [Pirates]
“If you die while I'm gone, do it quietly.” [Also implies the unspoken addendum: “because I wouldn't want to miss the fun.”]

Sayings

“That hound won't hunt.” [Indicates a poorly thought-out idea or ill-judged plan. Mildly insulting.]
“(caught) between the Dragon and the Desert.” [between a rock and a hard place - to face two equally unattractive possibilities.]
“No more Firewine for the Barbarian.” [said of someone going too far with a jest or a plan.]
“Fool's Gold”, or “To take Fool's Gold.” [An adventurer's watchword meaning to take on an adventure so dangerous that only a god of fools would attempt it.]
“A hero must move.”
“Fear and loyalty are the same word.”