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1.
Somebody, used in the 2010 hit tv show My Little Pony.
Rarity: Could somepony please help me over here?
by NDBurns March 07, 2011
 
2.
A play on the phrase "someone", where "one" is replaced with "pony". Used by the characters in My Little Pony and is also commonly used by bronies.
Has somepony seen the new episode of MLP?
by Haloya March 18, 2012