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15.
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 Damiana Dimitri December 21, 2010
 
16.
1: Will, 2: Most Likely, 3: Going To..
I'll prolly hit ya up tonight if I hear about a party..
by broranasuarsrex September 15, 2010
 
17.
a shortened version of "probably"
I prolly should have thought of that.
by redjen September 13, 2010
 
18.
short for probably.
i prolly wont have any money next month to hang out with you.
by itsnikki21 July 03, 2009
 
19.
1. (adv) With Certainty and easy to believe.
2. (adv) With high probability.
ETYMOLOGY: 1990s alteration of probably
1 "He will prolly go out with the beautiful
girl."
2 "A Dinosaur will prolly never eat a human."
by Theperm January 13, 2004
 
20.
a short word for all u lazy peeps who never feel like saying probably...
I will prolly be there tonight.
by reece&angel97 July 10, 2008
 
21.
Probably
It will prolly rain
by *sid* February 03, 2003