knock on wood

1. A phrase used to express that something will or will not happen. This expression alludes to the ages-old superstition that literally knocking on wood would ward off evil spirits.
2. To masturbate, said of males.

(made-up scene from GTA San Andreas)

(at the beach)

Kent Paul: (ogling a hot girl come out of the water) Oi Maccer, just take a look at what just breezed out of the blue. That height, that arse, those jugs, those curves! Blimey if I'd be given the chance now I'd get to chuck my junk in that, knock on wood!
Maccer: Indeed man! Knock on wood, eh. Well alright then! *starts masturbating*
Kent Paul: No, jack-off Jimmy, not... ohh, *mumbles* fucking Northeners!

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Mark H. Proud Urban Dictionary slang author since February 2004.

by Mark H September 30, 2005

knock up

to get a girl pregnant out of marriage(to get pregnant)

It is bad to get knocked up, you know that baby is gonna be messed up.

by katiecutie153 December 26, 2004

knocked up

to get pregnant; an unplanned pregnancy, unwanted.

fuck yo! i just knocked up this bitch, now i gotta pay child support!

by master p March 03, 2005

knock and roll

To ejaculate on one side of a double bed, then to roll over to the other side, allowing the love juice to dry before sleep. (a lazy man's wank)

"im going upstairs to practice some knock and roll".

by warb October 24, 2004

knock back

to drink or go drinking

after the basketball game a few of my friends and i are going to knock back.

by babi_grl247 March 03, 2005

hard knock

A hard knock, a gangster or sumone who leads a hard life or has been through hard times.

its a hard knock lyfe biatch!

by kyle April 08, 2003

knock over

To hold up or rob.

In New Orleans, every week someone tries to knock over a Popeye's Chicken store.

by octopod June 21, 2004