Definitions from Wiktionary (knock one out)
▸ verb: (slang, vulgar) To masturbate.
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▸ verb: (slang, vulgar) To masturbate.
Similar:
crank one out,
rub one out,
knock,
bash one out,
knock off,
rub one off,
jerk off,
crack one off,
jack it,
beat it,
more...
Opposite:
▸ Words similar to knock one out
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▸ Wikipedia articles (New!)
▸ Words that often appear near knock one out
▸ Rhymes of knock one out
▸ Invented words related to knock one out