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from "avalanche" and "lunch"; a huge amount of people and orders that come to restaurants, bars etc. everyday during the lunch break, especially downtown where various institutions and offices are situated;
Harry: I'm off earlier today?
Jim: How earlier?
Harry: Earlier enough to avoid the avalunch. Haha!
Jim: Oh, come one, man! You can't leave me with these hordes of office-zombies swarming the place!
Harry: Chill out! Mike is coming to back you up!
avalunch by KurtSteinerPL July 5, 2012

Party Avalanche

When you haven't been to parties for a while due to excessive studying/work.

Finally, you go to a party but it triggers the urge to party ALL THE TIME. Usually subsists after a week.
Student: Have to study hard. Gonna get that Ph.D.
Dude: You're going to Jenn's party tonight.
Student: OK. I suppose it won't kill me.

-1 week later-

Student: YEA PARTY AVALANCHE! I haven't been home for a week! This rounds on me!

Penis Avalanche 

The result of a crappy band name maker, Penis Avalanche is the name of the dopest jazz band in the northern hemisphere. Playing hit singles such as "Trunk of the Pussy Spray" and "Fuck Mel Gibson" the band has quickly gained success as the number one band in Albion, Washington.
The band has since broken up, and reformed so often, that most of the members have no longer play an instrument and instead stare awkwardly at each other for the better part of 12 hours while watching hipster music videos on Youtube and making fun of their poor bass player.
"I can't wait to see the Penis Avalanche, I heard they've reformed again!"

Swiss Avalanche 

When a man stands behind a bald person on their knees and slowly cums on the top of their head so it will run down the persons face, like an avalanche runs down a mountain.
“Man, I want to Swiss Avalanche on Amber Rose so bad.”

Wife: “Honey, the results are back. I have Cancer. Now, we can finally Swiss Avalanche like we’ve always wanted to.”
Swiss Avalanche by caseykills November 23, 2018

avalanche blasting 

The act of placing a generous amount of cocaine in one's asshole and snorting it as they fart in your face.
Bro 1: "Bro you look high af, what are you on?"
Bro 2: "Bro some hooker totally got me into avalanche blasting."

Anal Avalanche 

A term used to describe a males load that flows out of the anus area when a certain amount of time has lapsed after intercourse.
I jackhammered Karen in the ass last night, and as she stood up to get out of bed, there was an Anal Avalanche that ended up all over the place.
Anal Avalanche by Tee Cee Deez February 27, 2019