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2.
much like a titwank except using ones armpit.
'Mannn Jenny gave me the best pitwank last night!'
'Pitwank?'
'Yeah man, pitwank! Was mint!'
by HeyLook! October 07, 2008
 
1.
No hands?
No tits?
Use your pits!

You are the recipient of a pit wank when your girl clinches her arm close to her side and allows you to jerk off in the orifice that she has created.
Guy #1 to Guy #2 – Hahaha look at that girl over there her arms are stuck to her sides. She must have given her bloke a pit wank earlier!
by JPo74400 June 24, 2011