Top definition
When you are missing your bro or homeboy. So you master-bate to their image or think about them.
Bro:1 I miss bro 3
Bro:2 ya I miss him too that's why I was totally brosterbating to him last night
Bro:1 I wonder if he's brosterbating to us right now
Bro:2 I hope so

(brosterbation)
by Bro:3 October 20, 2011
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