The act of blowing up balloons with nitrous, and inhaling them while on psychedelics to enhance visuals. The key to playing clown is replicating the sound of a balloon being blown up by a clown at a party, or by a wook at a music festival.
Bro 1: Did you hear those balloons being filled up at our neighbors campsite until 4:30 am last night?
1. v. to not meet expectations.
2. v. to prevent someone from having intercourse.
1a. Due to your stupidity and lack of attention you really know how to cancel the clown.
1b. Are you feeling ok? Where's your head at? You're really cancelling the clown today.
2a. After dinner last night I thought my girlfriend and I were going to have intercourse, instead she cancelled the clown on me.
2b. I was really getting to know that girl through intense conversation and then my douchebagfriends intruded on my squirrel and cancelled the clown on me.
To announce something in a public forum (such as facebook) that is shocking and probably untrue for the sake of garnering attention.
"Anne posted on her page that IRS is after her for back taxes and she's going to jail for 15 years--even though she's only 17. That girl is an expert at blowing a clown."