An act where several individuals (usually male) masturbate in a circle (hence, circle jerk). This group activity was first practiced and invented in Australia.
"Kam, Jim, and Ted went to the bathroom for a quick circlejerk"
When you and your homies are hangin out and your all bored and horny.so,you all take off your clothes and jack-off your rock hard dicks together until you all bust those big fuckin loads.
Me and my homies were so fuckin horny we ended up having a circlejerk.