When you're really excited about something that is gonna happen and someone else says something negative to ruin your excitement.
Tom " o man Zack! I can't wait to see my girlfriend tonight!
Zack " yeah bro.. too bad she died today and you didn't hear about it until just now!
O BURN!!!!!!!!! That's a real Boner shrinker huh? Wow..Heh I'm so glad MY girlfriend is still alive and not dead like yours"
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When someone in your group is no fun and tries to ruin the fun for the group.
We were at the strip club and Norman was being such a boner shrinker and wouldn't stop talking about his problems.