An alternative name for a blowjob, or to suck someone off.

This word came about as, when performing oral sex, you neither "blow", or "suck".

It's just a bit of a mouthwank really.

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Mouth wank, when put your penis in a barely conscious woman's mouth and slop it about in a wanking action using no hands and no help from the lady in question until the point of ejaculation after which point the cock is wiped clean in her hair.

To get a wank from another person using their mouth.