-Man, she looks fine!
-Can't you tell? That's a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face, dude.
This occurs when someone attempts to prove how they possess a perceived desirable quality by over-exerting themselves which results in the quality appearing unnatural and contrived. Generally, the response to this action is negative and has the opposite effect.
Guy 1 - John thinks he is so tough because he grunts when he lifts weights.
Guy 2 - Ya, his Napoleon Complex is showing, he is totally trying too hard.
Girl 1 - Andrea is trying too hard. She thinks she is so hot when she pops her cleavage and shows her ass.
Girl 2 - Whatever, that skank doesn't realize we can see her cottage cheese thighs in that mini-skirt.