Calvin Clam Underpants

Pig featured on the advertisement.

Calvin Clam Underpants are a brand of underwear made from very sensitive fabrics which can sometimes cause allergic reactions. Developed by Calvin Clam, these underwear were made to be of the highest quality and comfort. However, as mentioned before, they can cause skin reaction such as boils and rashes. Pig has a severe allergy to these, but wore them for a fashion show called "Underpants-Palooza" to impress his parents (primarily his father).

The Gunk Knuckler is a newer model for this brand, specifically chosen by Calvin Clam himself. Supposedly, on a billboard in "Underpants-Palooza", a character very similar to Armpit Willy could be seen modeling the underpants for the brand. This could just be another similar character, however.

In Mall Ya Later, an ad featuring Pig could be seen outside The Mall.

In-Universe Food Brands
Banana's Own Sauerkraut • Bran Flakes • Butt-Wheats • Designer Leather Eyeballs • Diet Flapsi • Doctor Dude's Dog Biscuits • Frosted Keister Wheats • Goaty Oaty O's • Honey Rump Smacks • Monkey Chow • Pickle Pop! • Pickle Seeds • Police Flakes • Quickest Oats • Super Golden Honey Crispies • Sweet Pickle O's • Tiny Fire Hydrants
In-Universe Toys
Bot-Buddies • Fun-Box • G.I. Moe • Miss Cutesy Meow Meows • Tubey Dude
In-Universe Books
Book of Gorf • Cowboys and Rats • Dog Shows for Dummies • How to Quit • One Heart, Five Toes • Why Bother? for Dum Dums • Yum Yums for Dum Dums
Miscellaneous
Awesome Shoes • Boopelite Herald • Calvin Clam Underpants • Candy World • Fast Growing Evil Monster Plants • Fowl • Genius Gazette • Manana • Moose Mousse • Pimples No More • Pocket/Prison Tears! • Popular Pickles • Slop-nopoly • The Daily Clam • Zits B Gon