Top Definition
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
#speed #adderall #sex #twack #tweek
by man in yellow hat October 15, 2009
5 Words related to twacking off
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