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1.
Phrase used to describe to describe masturbating shortly before having sex in order to prolong intercourse; most effective after a long dry spell.
It's been a while since I got any so I had to knock the top off before we did it.
by Niki C January 12, 2006

Words related to knock the top off

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2.
To give oral sex to a male
knock the top off eg:
Hey Rolfus, how did you go with that waitress?
" She knocked the top off "
by Bigwoody76 April 28, 2010