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31.
As most people prolly know, "probably" was substituted by "prolly", because many got annoyed by the stutter. The new word became popular after Clinton's proposal for more honesty in birthday hymns:
"For he's prolly a good fellow,
For he's prolly a good fellow,
Which I can neither affirm nor deny."
by AlG38 November 20, 2006
 
1.
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
 
2.
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
 
3.
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
 
4.
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
 
5.
The way lazy idiots say the word "probably." Another internet bastardization that makes some want to stab whoever uses it in the foot.
Moron: "shut up, you fucking cock, you prolly dropped out of high school and now fuck your fat landlord to pay the rent in your shitty apartment!!!!"

Educated Person: "You should probably...I mean, "prolly" die very soon."
by Ryan McGinnis January 02, 2006
 
6.
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 10, 2008
 
7.
A shortened form of probably, used mainly in texting and emails.

1: Are you coming over tonight?
2: Yea, I'll prolly show up for a while.
by Lyssa DL May 12, 2008