1) To destroy someone by using a chair defense.
2) To put someone in their place
3) To "rage" on one's "melon" using the highly feared "chair rage".
1) "After I set up the chair defense, we just sat back and watch the other team get cha'd."
2) Jam: Kith sucks! -- Wippuh: OMG Cha'd!
3) "Holy shit! I went into their spawn, and shanked the whole team! I got a screenshot, too! Cha'd!!"