Top Definition
To lose focus and completely forget something.
"Oh man, I totally gapped out on picking up my girlfriend from the bar!"

"I'm such a fucking gap out, I didn't hear anything you said"

"Sorry about that, I totally gapped"
by reppinCDNslang December 07, 2007
To become distracted from the task at hand and focus on another idea of a different tangent.
"I didn't hear a word you said, I just had a massive gap out!"
by noah_pr December 03, 2007
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