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Done by jumping into someone exposing only your chest to the impact, often the arms are angled backwards to avoid any contact other than that with the chest.
The target is usually unsuspecting, however angering a chav may also lead to a chavjumping.
In some rare cases non-chavs use the chavjump as a way of greeting.

Chajumping can also be played, this is done with a few game members, one by one picking a target(usually a chav) for each other to chavjump. After the chavjump is complete, running after the jump can mean ban from the current game.
Omg! a fiver says you run after chavjumping that Chav!
by Steve!e B November 05, 2008
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