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Shortened version of "probably". Typically used in online conversations, although REALLY lazy people have started using it in verbal conversations as well...
I'm feeling lazy so I prolly won't bother doing homework.
by Sarah February 04, 2004
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A spoken colloquialism that existed pre-internet, despite what many people claim.

"Prolly" is a clipped pronunciation of "probably"; compare with "g'day" as a clipped pronunciation of "good day", or "gonna" as a common spoken shortening of "going to".

Certainly non-standard, but not necessarily indicative of the writer's laziness. For some, writing in this manner mimics their natural speech pattern/dialect.
She said she'd prolly come over after she's finished relaxin' at the beach.

(spoken example) "I'm prolly gonna head down to Toranna {Toronto} for the May 2-4."
by nimsicle January 29, 2010
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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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'Probably' as said by people who live in the delusion of having an infinite amount of swag.
Chinoy : "Hi, I'm Chinoy. Prolly I'm busy right now. Why don't you leave me a message?"
by antweb December 26, 2016
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