toe knife 

a culinary knife used by Frank Reynolds (played by Danny DeVito) of cult hit sit-com It's Always Sunny in Philadelphia to scrape foul matter from beneath his toenails, causing other characters to comment on their disgust. The knife is probably riddled with disease. Frank uses the knife for other things such as eating.

"Heyo Frank what you doin'?"
"Just usin' my toe knife to cut this bread"

"That's disgusting Frank"

toe knife by it'sgatsbybitch June 21, 2016

toe knife 

Toe knife is a very sufficient way to clean the shit that lingers in betwixed your toes the toe knife is usually dirty and that's okay because it scrapes off the scum that is living under your feet

Hey man can I borrow your toe knife I lost mine at the county fair

toe knife by Cactus clarity September 8, 2016