Usually used in MMORPG's, such as World of Warcraft
"LEEEEEEEEEEEROOOOOOOOOOOOOOOOOOOOY!!!" <---this is when the one-man charge, or "leroy moment" happens
"OK, he just ran in there... come on, help him!"
changes his mind about who he likes every few days and has the ability to ignore someone indefinitely.
BUT he can also be pretty sick and awesome friend and is fun to be with.
The name "Leroy" being more common a name amongst African-American males than of any other race.
that you've got a big dick, but I never dreamed..... OMG!!!
Think we're gonna have to start calling you Leroy from now on mister!" (*sigh!!*)