wack, wacko n: A person regarded as eccentric or irrational.

wanker n:
1. A person who masturbates.
2. A detestable person.

waste v: To kill; murder.

wasted adj: Intoxicated; drunk.

wedding tackle n: The male genitals.

weed n: Marijuana.

weirdo n:
1. A person regarded as being very strange or eccentric.
2. A deranged, potentially dangerous person.

wet adj: Refers to the wetness of sexual arousal of a woman: She's wet and ready Idiom
all wet
Entirely mistaken.

wetback n: Used as a disparaging term for a Mexican, especially a laborer who crosses the U.S. border illegally.

whack n:
To kill deliberately; murder.
Phrasal Verb:
whack off
To masturbate.
Idiom:
whacked out
1. Exhausted.
2. Crazy.
3. Under the influence of a mind-altering drug.

whitey n: Used as a disparaging term for a white person or white people.

whiz also whizz
Idiom:
take a whiz
To urinate.

whoopee n:
Idiom:
make whoopee
1. To engage in a noisy, boisterous celebration.
2. To make love.

whopper n:
1. Something exceptionally big or remarkable.
2. A gross untruth.

wimp n: A person who is regarded as weak or ineffectual.
intr.v. wimped, wimping, wimps
To be timid or cowardly. Usually used with out: wimped out and refused to jump off the high diving board.

windbag n: A talkative person who communicates nothing of substance or interest.

windowpane n: LSD.

wino n: An indigent wine-drinking alcoholic.

wood or woody n: An erection of the penis.

wop n: Used as a disparaging term for a person of Italian birth or descent.
[Italian dialectal guappo, thug, from Spanishguapo, handsome, dashing, braggart, bully, from French dialectal wape, rogue, from Latin vappa, flat wine, scoundrel.]

works n: A thorough beating or other severe treatment. Used with the: took him outside and gave him the works.
Idiom
To inflict severe physical damage on; beat up.

wuss n: A person regarded as weak or timid and especially as unmanly.
wussy adj. [ Probably blend of wimp and pussy]