Top Definition
jacking off
Harry:Ron my god Hermoine looked sexy tonight.

Ron:Yeah I know I am going to be whomping the willow
by K-man 45322 May 04, 2009
5 Words related to Whomping the willow
Masturbating to any of the eight Harry Potter films.
Frank: Dude are you comin out? We're at the bars.
Me: Nah man, I'm whomping the willow tonight, sorry.
by Cloudy McMillet January 20, 2015

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