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slow, not smart. Not stupid, just not quick on the uptake.
I closed in for a kiss, but ed was a bit flat-headed and failed to pick up my cue.
by henrysfeelingfine January 03, 2007
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otherwise known as; to be a Flathead. basically meaning slutty, jerky, or diddlerish.
Girl #1: and adam hooked up today..
Girl #2: are you guys dating?
Girl #1: no.
Girl #2: *gasp* that's so Flatheaded of you!
by diddlegirl69 February 17, 2010
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