Sex Knacker 

Sex Knacker: A male slut. Used to descride a man who sleeps around and doesnt call the girl/guy the next day.

Wow, Joey has been a real Sex Knacker these days.

Sex Knacker by Fat Al Kelly March 9, 2007

knicker sex 

Rubbing a hard penis or hand against your female partners knickers. No penetration should take place but an orgasm can be achieved through this technique.

It results in the female having to change her knickers afterwards as they will be suitably wet.

We rubbed each other senseless through the knickers region until we both came like teenagers having knicker sex

knicker sex by Barty75 November 18, 2016