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1.
To weasle is to talk to a member of the opposite sex, apparently innocently, when in fact you intend for sexual activity later, and everyone else knows it. Used more by males about females

Epsom College 6th Form
Mate you fucking weasled her/him hardcore
Mate I'm on the wease
Mate I am already weasling her/him
by Beeman And Campo April 20, 2005
 
2.
person or persons who mannage to sneak out of any trouble or situation.
the weasle escaped again!!!
by fife April 28, 2006
 
3.
a very, very small dick
i laughed when he showed me his weasle
by trevor82 February 17, 2010