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When a phenomena occurs without any planning or communication, and is executed perfectly by multiple participants as if planned.
John and Joe walk up to a control box with two buttons. John and Joe look at one another. Nod, say "Hailstorm." And then in unison push both buttons at the same time.

John and Joe walk up to a cliffside. John and Joe look at one another. Nod, say "Hailstorm." And they both jump into the water below at the same time.
hailstorm by AnujSuper9 November 2, 2009
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When you celebrate taking a shot by taking another shot.
Oh nice shot man, let's hailstorm that and do it again!
hailstorm by AnujSuper9 October 31, 2009
the sexual act of snorting your partner's cum, and then sneezing it back onto them.
"Bruh, Stacy hailstormed me hardcore last night."
Hailstorm by AlphaWaffle November 24, 2014
the act of being a total 1 upper, or trying to be the most extreme person in the world.
Hey did you see hailstorm clear that 6mi jump with his bike.
hailstorm by 152sumos May 22, 2008

hailstorm no 

a derivative of hell no (taken from the Old English 'hel' and 'na'), used commonly as an alternative to the phrase.
"Hailstorm no! You did NOT just do that!"
hailstorm no by k9krunchies9 December 15, 2008

hailstorm razor 

The act of bending your sexual partner over, getting a broom, no the handle side, and cleanin out either their anal or vaginal area, screaming,"HAILSTORM RAZOR"
"HAILSTORM RAZOR" *shoves broom up Becky's fat ass*
hailstorm razor by This dick December 5, 2014

Hailstorm Mk5

Jesus, the Alt fire on the Hailstorm Mk5 is insane! It annihilates Dozers so fast!
Hailstorm Mk5 by Ronin is the best November 8, 2022