Um... I believe I just read something about that! *digs through printed grammar papers*
Okay, I'll quote:
"kiri and giri come from kiru, to cut. This postposition is similar to 'only/merely' in a confining matter, as opposed to dake, which is an open-ended-only:
japanese: ふざけなと行った切り
english: "Don't screw around!" he (only) said."
hope that helps you ^^