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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 10, 2008
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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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Obviously a shortened word for 'probably' now used in internet conversations. Before the advent of this usage, it was commonly used in southern U.S. states in particular Texas as common vernacular and does NOT indicate laziness but dialectal and regional verbage.

Using 'prolly' is not a sign of idiocy or laziness but apropos savoir faire, subcultural quirks, accents and mannerisms just like many other phrases that come out of regional places.

Just think Pigeon English in Hawaii, Brooklyn slang or English/British expressions....we all got 'em!
Y'all prolly think I'm dumb for using this but it ain't so. I just wanna get to the point faster without havin' ta use so many goddamn letters! ;D
by Damiana00 December 21, 2010
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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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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
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A shortened version of "probably." Known to be used by Tyler Joesph, the all amazing smol bean of Twenty One Pilots.
Person 1 - Yo, will you go see that new horror movie that's out?
Person 2 - Yeah, I prolly will!

Person 1 - Okay, see ya there!!
by penceyprep June 17, 2016
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it means probably not
a short form used by many people
originating from the peterborough area
when referring to someone writing your essay for you

Oh, yeah, she'll prolly write that for him
by ginger snapper February 20, 2011
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