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1.
n. to distill important knowledge about a subject and share it with those new to said subject.

often used in internet forums to criticize new members if they break the forum rules.
New member: hey everybody! a/s/l??
Experienced member: protip: this forum is ALL male.
by Shifty Eyed Goat October 12, 2004
 
2.
A tip intended to convert a novice to an expert.
PROTIP: To defeat the Cyberdemon, shoot at it until it dies.
by Zoni Nation January 07, 2008
 
3.
Obvious advice sarcastically presented as sage wisdom.
Protip - don't call the cops reporting your weed stolen.
by Matt F . February 02, 2009
 
4.
To offer advice or suggestion to resolve a problem. Often used in context of emphasizing common sense, a very strong opinion, or to belittle/mock a person's point of view.

Likely taken from GamePro magazine, which used the term as early as 1989 in conjunction with screengrabs of video to capture reader's attention to offer advice on completing video games and tying the term into the publication's title.
Protip: Don't raise your voice or joke about guns at the security station in an airport: you're asking for trouble if you do.
by Urban Squirrel January 06, 2009
 
5.
A helpful piece of information or advice that may be generally unknown or secret. Originated in GamePro video game magazine.
"Oh, you have Professor McGee? Pro Tip: don't say anything bad about gay marriage in her class; she's a lesbian."
by Quetza1coat1 April 07, 2010
 
6.
A tip made by pro's in a certain field/area of reality.

Protips are generally tips designed to help an individual with a task, by describing how to make it easier, ways to cut corners without damaging the final product, and little tricks that have been found to do the task or make it easier/better.

Protips are also confused with/share common idea with life hacks. Don't be confused, life hacks are for life; and Protips are for everything you do in your life.

Found quite commonly on Infographics or 4chan.
Protip: Want to make your essay look longer? Increase the font size from 12 to 12.5 (no more, or its obvious), Move the margins out by 1/8th of an inch, and increase punctuation (full stops and commars are hardest to notice) size to 13 or 14. You have now added half a page to a page extra.
by el-granto October 18, 2011
 
7.
An advice you didn't need, coming from a person who thinks he is better than you.

This can often be related to video games.
In a game of Dota/HoN/LoL

Mortane: dude your K/D is terrible, if you keep dying get some more HP

honrockzers87: ... I would if I could save up some gold...

Walroz: lol Mortane, pro tip!
by Sentrax September 09, 2010