Top definition
To jizz on a girls gee without them knowing causing them severe embarrassment later on.
Mackerbate is to masturbate and jizz on your partner's gee while they are sleeping, after which you go to the local shop. Then when you come back with the breakfast and your partner wakes up, they're morto because they think that they're after having a dirty wet dream!
by Someone else you don't know November 12, 2011
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