When an uncircumsised man, whilst urinating, pinches his foreskin closed, thereby inflating his touque like a balloon (but with urine rather that air)
My girlfriend won't give me head since she caught me ballooning in the bathroom.
by Don't worry about it1 July 18, 2006
When someone start to get fatter and fatter.
My wife was gorgeuos with a killer body before marriage, but after the marriage, she started ballooning.
by Gary Ng July 30, 2004
One of the most fun things to do in the entire world. An act that consists of a large shopping bag full of water balloons, skilled throwers, and a patient driver. The people drive around looking for innocent pedestrians, and they launch water balloons at them. This is very fun (especially if you know your victim), but extremely hard to get good at.
Variations of this activity include a game, where you score points!

1 point for a snipe. (a hit anywhere that gets them)
2 points for a direct hit. (an awesome shot that nails them.
5 points for a head shot. (rare but rewarding)
Dude #1: "Yo guys, let's go ballooning, I think my brother and his friends are walking home from school."

Dude #2: "Hell yeah, I'll snipe them, so bad they will look like they jsut got out of a wimming pool."
by Dan May 21, 2005
Ballooning is when you and possibly another friend steal a huge bunch of mylar balloons from a grocery store, like a Safeway, for example, then take them to greet your friend at the airport.

Care should be taken to check the flight landing time however, so they don't come in early and you're just stuck with all those balloons.
Pike: Hey Farkus - let's go to the Backside and have a few drinks then go Ballooning when Gordon flies in tonight!

Farkus: Hell yeah!
by candyman22 September 9, 2019
Being high and very enjoyable to be around.
Shit, Heathers amazing. But when shes ballooning, i just want to do it with her.
by hspence February 19, 2007
A man who is fascinated with large breasted women, who as a child was deprived of his mother's breast milk and was a bottle fed baby.
Look at Fatty drool over cattle Sarah's chest, he's a balloons!
by Cattlerider January 8, 2017
A balloon filled with nitrous oxide, or NOS (laughing gas). You can usually find balloon dealers outside parties, raves, music festivals or other such gatherings. As soon as people hear a dealer inflating a balloon they flock round them like sheep. Balloons are the second most popular drug in the UK (aside from weed). Also goes by the name of Hippy crack.
Dealer: You came to buy balloons bruv?
Client: Yea man (hands over cash)
Dealer: Calm G, this is 100% medical grade NOS. This shit'll make you trip. (Loudly inflates balloon)
by dankcuddlybear October 29, 2018