look up any word, like the eiffel tower:
 
1.
Standing over your opponent's bed while you shove cookies into your mouth and chew voraciously, spreading crumbs throughout said opponent's sheets.
I hated his online persona so hard that I went over to his apartment and cookie monstered him hard.
by DJ Starfleet July 16, 2011
 
2.
The act of taking a thizz by chewing it and smiling.
I just popped my thizz but I can't believe that crazy fool Beats just cookie-monstered his!
by sickbeats May 16, 2007