A shortened way of saying probably.
Friend 1: Hey Isaiah, you want to shoot some hoops?

Friend 2: Prolly
by J.J.Clark October 5, 2021
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 5, 2004
This is a colloquial version of the word "probably", in common usage in the upper Midwest, especially those areas of Wisconsin whose populations were drawn from German-speaking immigrants like Milwaukee and Madison. Definitely predates Internet.
I'm prolly gonna get some cheese fries with that.
by Thoringerveer March 18, 2016
'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
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 22, 2010
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