Literary colloquialism for "probably", most likely first used in print in John Kennedy Toole's Confederacy of Dunces, (1980), in the speech of one of the book's characters, the mother of the protagonist, Ignatius J. Reilly. The use of the word is meant to reflect the speech typical of white working-class residents of New Orleans, Louisiana.
That prolly is the reason he left in the first place.
by Christopher Henry September 21, 2005
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Web-slang abbreviation of "probably". Used extensively in forums and instant messsaging worldwide.
Red: I'll prolly cream my shorts when they release Halo 2.
Blue: You're such a cockbite.
by SticKboy April 14, 2004
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I prolly have forgotten any basic English I learned in school.
by raindance August 18, 2003
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Shortened version of "probably." Used by lazy people who justify the misspelling by claiming that it is faster to type 6 letters than it is to type 8 letters.
I could prolly save more time and appear less stupid by typing "prob" instead.
by Dream_On January 6, 2012
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1. adv. - shortened variant of "probably"; in all likelihood; likely. Typically used online.

1. You should prolly used "prolly" only in instant messaging. Using it in real life sounds kinda lame-o. But I prolly won't follow this rule anyhow...

Usage Notes: Using "prolly" and other forms of internet slang do not make one an idiot, unlike many of the arrogant people here have established. It is used simply because it is quicker to type "prolly" than "probably".
by Rerakudeshigunesu February 11, 2008
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For Idiots who cannot spell probably correctly use this version.
I am prolly stupid because I cannot spell probably.
by Lindskay July 31, 2006
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The lazy and misspelled use of the word "probably".
She didn't get on chat today, and prolly had to go to work.
by Halfshell March 17, 2013
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