Gnat's Chuff

If something is extremely tight, then it could be said to be 'tighter than a gnat's chuff.'

"So there I was yeah, just pulled this crackin' bird yeah, took her upstairs, took her mini off, and whoa! She was tighter than a gnat's chuff!"
"Colin, please don't talk like that at the dinnertable."

by Bonny lad November 11, 2004