gwack is another name for giving head better known as a BJ aka Blow Job
this name is taken from the sound you make when you deep throat and your gag reflexes go off "gwaaaaaaaaacckkk"
"Gwack 2.0 " is giving/recieveing head by/from a sexual partner
I was at this party last week and this hun offered me "Gwack", she went down on me hard
My girlfriend prefers to swallow when she gives me "Gwack"
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