It stands for inter-gender sleepover. It is a sleepover with both guys and girls, usually consisting of 2 guys and their girlfriends. It is usually one of the best events with the opposite gender in the world of people age 15-18, and almost always leads to sex, or at least other intimate contact.
My friend told me about an IGS he once had, and it sounds amazing. If I ever make the insane decision of possibly ever getting a girlfriend at some point in the next 2 years, I am gonna call a friend and his gf to come over and have it.
by M@77 J@M35 April 2, 2012
Get the IGS mug.
Ig, Almighty vulture God with fuzzy beek and cushy feeps.
Great Ig cares for all who would care for his birdies. Those who love birds - apart from the Kentucky Fried Chicken variety - and would nurture them, have a sure home and refuge in his flint-like heartbone.

'Great Ig, have mercy on us that show mercy to your birdies, and care not that they occasionally poop on our hats.

Amen'
by Keeper of the Ig June 18, 2006
Get the IG mug.
Immature Gym Syndrome.

When someone claims they know how to body build, when it is clear they do not.

When said person posts comments on social networking sites about anything to do with their training.
When someone makes baseless, uneducated comments on the effectiveness of a supplement or training method.
Guy 1: "Yea, just eat whatever you want and drink a protein shake and you'll get big."
Guy 2: "You don't need to plan your meals, as long as you use supplements."
Guy 3: "Typical case of IGS."

On Facebook- usually a small guy: "Just had the best gym session."
Everyone else: "IGS"
by IGS Stan February 20, 2012
Get the IGS mug.
If you bump into somebody on a New York City train, say "Excuse me" and just walk away. Ig him or her if s/he throws 'tude.
by pentozali March 10, 2006
Get the ig mug.
Ignatz Maximilian, Graf von Loeffelgeier und Suppenbecher, born March 2, 1746 in Thuringia. Faithish retainer and right-clawed assistant of his BM Beloved Master, HE The Lord S. The oldest living thing on the planet that is not made of wood, Ig for short is the constant companion of HE The Lord S in his world travels and travails, and the present bearer of the physical manifestation of the EYE of IG, the Holy Stone of the Mighty Vulture God, Ig/IG. He is grumblish and bad-tempered, but has served his BM's family since the mid-19th century, and his BM since birth. He thrives on a mixture of chocolate of any kind, muffins and lemon maringue pie, which he causes to disappear at an astonishing rate. He collects pins but is v. partial to anything related to trains, and has a large and enviable collection of DVDs, videos, and train memorabilia. Seeing the advantages to be gained by the use of steam transport, he invested heavily in the original railways of Great Britain, and is therefore filthy rich in his own right, but wisely choses to remain low-key about it, adopting a servant-like attitude tempered with an acerbic wit, general curmudgeonly exasperation and sharp ironic sarcasm that would be the envy of any politician. He is well-loved and/or tolerated by all fortunate enough to make his acquaintance, and can finish the 'Times' crossword, in ink, in less than three minutes. His general appearance, that of a foot-high fuzzy-topped vulture with a bright yellow beek, should not trick the unwary - he has a very powerful grasp on small items that venture his way coins, candies and the like as well as a very powerful grasp of human body language. A lool from his beady eyes can wither corn stalks at fifty paces. He is NOT to be taken lightly by anybody who wishes to retain all their original fitments.
by HE The Lord S June 20, 2006
Get the ig mug.
IG: BumStatusYo is where i can be found live what's yours #IG
by BumStatusYo December 19, 2018
Get the #IG mug.