Top definition

When a bro stops hanging out with you out of no where, cancels plans, or stops answering texts from you.

Especially when a new girlfriend is involved.
Bro1"Hey bro2 where is bro3 at? I thought he was kicking it this weekend?"
Bro2"Nah Bro1 he got that new girlfriend so he has klunked-out here lately."
by Dread Cpt Planet July 31, 2016
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