thwacking off 

A boy or he-she who is playin with his feet, mouth and belly button

That boy Damien(omenboy 127) thwacks off cause he doesnt know what jerkin off is...lol.

thwacking off by harleygirl June 18, 2003

twacking off

when you are on a stimulant such as Meth or Adderall and your sex drive is making you so horny you decide to jack off but you take longer to achieve an orgasm because of the shrinkage involved with using an amphetamine

i took a second adderall on accident and was so horny i was twacking off and it took me three hours to cum

twacking off by man in yellow hat October 15, 2009

Tacking off 

masturbation through your nipples or your man boobs while doing it with someone already at the same time.

guy1: Bro you know what i did last night?
guy2: What?
guy1: I was tacking off.
guy2: with who?
guy1: Your mom bitch!
guy2. Fuck...

Tacking off by FatalB0n3r June 16, 2011

Twackin off 

The act of texting and masturbating to a person you have never met.

Was Te'o caught twackin off or what!!? Asked Marion.

I guess man, why don't you text him. Said Peyton.

Twackin off by Jadedfan January 18, 2013