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4.
Someone with technically large feet or body shape similar to a swimmer. In this case, similar to the swimmer Michael Phelps.
"Look at the size of those feet! He looks like Phelpsy! Phelpsy!!"
by bluewonderpower July 23, 2012
 
1.
Combining Oliver and James Phelps (George and Fred Weasley from the Harry Potter Series by J.K. Rowling) in a sentence. Instead of saying "Oliver and James Phelps," one would say "The Phelpsies are awesome."
"I adore the Phelpsies!" or "The Phelpsies rock."
by raininoctober June 24, 2007
 
2.
Members of the anti-gay group who protest at the funerals of American military personnel killed in Iraq, led by the Rev. Fred Phelps. Phelps believes American deaths in Iraq are divine punishment for a country that he says harbors homosexuals. The group finances their activities by suing churches and individuals by claiming impairment of their First Amendment rights and assault by angry and disgusted mourners.
"Those Phelpsies are some sick bastards and sure aren't Christians."
by Fallacy Slayer April 11, 2008
 
3.
Used to describe:

1. A performance of epic proportions, one which no one else has ever done before.

2. A ridiculously fast speed.

Named after record-breaking U.S. swimmer Michael Phelps.
1. Our team is playing well, but we're not good enough to be considered Phelpsy.

2. I got pulled over for driving too Phelpsy.
by Roy Brown August 15, 2008