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When you are performing oral sex on your partner and they pass a SBD (Silent but deadly) fart.
Wow! Man I was going down on Becky and the next thing you know she puffed a breath of fresh air right in my face! I was so grossed out that I left.
by Ini & Dom December 02, 2008
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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