And below in the spoiler box is the full list of 45 weapons! There are some great ones like Bumpity Boom, Peace Out Roller, Deadstar Hug, and Infinity Gig, but that popcorn one is even more over the top.
Cherry Blast
Zip Zapper
Buckshot Dance
Distance Needler
Triple 7
Humerus Crush
Popcorn Demon
Banzai Beetle
Lost Lamb
Serotinal Bullet
Go-Getter Right
Spoiled Brat
Egoistic Pill
Golden Right
Infinity Gig
Front Runner
Trident Line
Fatboy
Fire Murrain
Longshot Gizmo
Cerebrus Phantom
Nervous Ghost
Rising Specter
Straight Nightmare
Necro Burst
Metal Crescent
Quick Homesick
Parasite Sword
Two Headed Slash
Marooned Tomahawk
Bumpity Boom
Rumbling Bang
Splash Hit
Territorial Pow
Bang Away Bomb
Deadstar Hug
Peace Out Roller
Sword Bouquet
Hot Icicle
Stubborn Crawler
Wild Horse Kick
Dragon's Wrath
Green-Eyed Lamp
Sea Dragon's Rage
Burning Drive
The only way to make a decision here is to imagine Vile saying each of these weapon names while attacking with that weapon, like some sort of shounen anti-hero.
This leads me to vote for Deadstar Hug. Territorial Pow was a close second. Honestly, though, a good 25% of the list is good enough to be the correct answer.