To have lost a race, such as a swim meet, by an incredibly small margin by someone's final burst, such as when Michael Phelps won the 100 meter fly by .01 seconds in the 2008 Summer Olympics.
Dog, he just Phelpsed your ass!
To push away hard and then turn around and go in the opposite direction (like a swimmer at the edge of the pool)
My ex-boyfriend tried to hug me and I totally Phelpsed him.
Like pwned, yet HARDER!!! AND FAR WORSE!!!
Dude, those horde just got Phelpsed!! or Man, that alliance just Phelpsed the shit outta me!!!
to lose (or to win) by a small margin, as in 1/100th of a second.
The other swimmer was phelpsed by the taller, faster one.
When someone takes a picture of you obviously under the influence of multiple narcotics or in the process of administering your medication. Then tags it on facebook for the entire world to see.
Damn, Carissa tagged a photo of me rolling face, half naked covered only in glowsticks and my grandma saw it. She totally phelpsed me.