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2.
synonyms: whack, smack, hit, beat
I just hwacked my head on the cabinet.

This bird poo came out of no where and hwacked me in the head.
by wraith August 27, 2004
 
1.
v. hwhacked, hwhack·ing, hwhacks

v.tr.
1. To repetatively stroke with a sharp slapping blow to provoke pleasure; pleasure-orientated activity; self-pleasuring
2. To masturbate strenously.
v.intr.
To bring pleasure to oneself. Hwack-ing off.

n.
1. A sharp, swift slap.
2. The sound made by a masturbator.
Phrasal Verb:
hwhack off: Vulgar Slang
To masturbate.

Idioms:
have/take a hwhack; Informal
out o
f hwhack; tired Informal
hwhacked out Slang
1. Exhausted.
2. Too much self-pleasuring.
1. Billy hwacked off furiously

2. Furiously hwacking off, I was rudely interupted by my mother
by sillybuggers August 28, 2006