knock the fuck out
Canadian slang;
to knock the fuck out is offering to perform oral sex. Euphemism common among the bath-houses of Toronto and Craig's List. This is unconfirmed.
Synonyms for knock the fuck out
On this page, you will find 30 slang terms related to knock the fuck out. Some of the top words include: Blow Jay, mother canuker, facetime downstairs, Fuckin eh, eh-hole, and 25 more.