When the diameter of one’s penis supersedes the length, by at least one inch.
My boyfriend and I were about to have sex, then I saw he had a flatter patty.
by Mike Scott, regional manager September 21, 2019
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To complement someone multiple times over a short period of time.
Alice: "I love your boots, Kate. And those tights."
Sally: "And your green coat is very cute!"
Kate: "Wow, this is such a flatter fest."
by casp82 January 27, 2009
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UK motor sport slang for taking a corner with the throttle pedal flat to the floor without lifting or braking.

Al variation is "Ari flatters" after rally driver Ari Vatanen.
Webber took the Bus stop Chicane Harry Flatters.
by junkcatcher2 December 5, 2010
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1.) when someone gives you a compliment and you have no idea how to react. when this happens close your eyes and laugh out loud to yourself enjoying the moment.

2.) when you tell a joke that no one else found to be funny, or no one else heard at all and you proceed to laugh to yourself.

3.) A smugness
Sebastian: "damn Randy that sure is a nice beard you got going there."

Randy (inner monolouge): "I never really thought it looked that good, but alright ill flatter myself...haha, hahah, hahahahaha!
by The Macho King February 28, 2012
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Something a girl says to a guy when he tells her that he has feelings for her. She will say it if she is to kind to admit that she would never feel the same in a million years.
Boy: "Susan I think you are amazing! A have had feelings for you for a long time now."

Girl: "Well I'm flattered, but I think we are better as friends."
by FriendZone12345 March 12, 2012
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When you are implying something that insinuates your good or attractive, or another positive attribute.

Usually used when talking with a stuck up person, someone who’s playfully over confident or someone trying to playfully deny feeling or emotions without shutting someone down.
Person A:(playful condescending tone)“Wow, you really find and excuse to hang out with me don’t you?”
Person B:”Don’t flatter yourself”

Person 1:”you keep looking at me hehe, ik im pretty stooopppp, *giggle”
Person 2: “Ptf please stop flattering yourself you ugly bitc-“
by ferngully0 August 12, 2021
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A presidential projection, meant to flatter himself while flattening the curve, without basis in medical fact.
With his Sharpie he drew a limp line, flattering the curve of new infections.
by Monkey's Dad March 24, 2020
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