Internet Service Provider. Your choice of an ISP can either be bery wise and beneficial, such as choosing SBC Yahoo! or EarthLink, or give you an idea of what Hell is like, by choosing AOL.
Words cannot describe how much AOL sucks. Worst ISP ever.
by anonymous June 20, 2005
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Internet Service Provider

It may not seem like much, but this word is one of the scariest things to an amateur hacker-the ISP can see through any proxy.
Hey, your ISP found out about that file you illegally downloaded.
by Kirby Kile October 10, 2012
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ISP is the provider of your internet (AOL, BT, NTL etc). AOL is a brilliant example of a gay ISP.
AOL is a gay ISP, Cause they're shit!
by NeoPuma August 2, 2004
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ISP can either mean
'internet service provider'
or
'inscribed signed photograph'.
My ISP (internet service provider) is AOL.

I sent a fan letter to Elijah Wood and got an ISP (inscribed signed photograph) back instead of just a copy.
by katie w. May 20, 2005
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1) ISP stands for Internet Service Provider aka the company that supplies you with your internet, drr.

2) ISP also stands for I Smell Pussy. You can write this whenever someone online is being a pussy and won't do something.
1) "What's your ISP? Maybe that's why your connection is so slow."

2) Massa J: "Let's go play some CS:S"
Doobie: " I can't man, I have homework."
Massa J: "ISP"
by Doobie Smokes You January 30, 2005
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Abbreviation for I Suck Penises, 'nuff said.
person1: ISP
person2: O.O
by Flitzepeng September 25, 2010
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