Top Definition
A feeling evoked by an extremely pleasant surprise. That is, the simultaneous feeling of being flattered and flabbergasted.
"Today I was told that I was sexy. A hobo told me this. I was flattergasted."
by Slick Rick Bacon May 09, 2005
1 more definition
A state of uncertainty, brought on by an unsolicited or unwarranted barrage of compliments. This sensation is typically followed by the raising of a bullshit alarm, and is most usually induced by a frenemy.
-"Oh, cutie, you have been so funny tonight...(later at the same party)...that's a really nice shirt. It really brings out your eyes, and I've never noticed how amazing they are...(yet again, later, same party)...this is the best sex I've ever had. I've never felt this way with anyone before. You are without doubt the best lover in the world"
- (you, all the while, thinking:) 'Uh, ok(?)...uh, whatever...Is she for-fucking-real? This was a mistake. I'm so utterly flattergasted right now. '
by jawasan August 05, 2015

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