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1.
a penis that is misleading and turns into a waste of time fucking all off beat
I been talking with this dude for a minute so I was pissed off when he gave me that weak dick.
by disappointedwoman October 11, 2008
 
2.
someone, or something so extradanarily lame it/he/she evokes the character and disposition of a superiorly lame, impotent, useless penis.
This fuggin' Calculus class is weakdick man!
-or-
WEAKDICK! You took my last fuggin' beer you chauncey! BURNT!
by chauncey mcfadden November 06, 2003
 
3.
A penis incapable of successfully sustaining an erection.
You have a weakdick on Thursdays, aye? I suppose my mom won't be at your house on Thursday then.
by B-Drac November 08, 2003