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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
 
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