When your anus has gotten wet from splash back or you have cheap toilet paper, then as you wipe, your finger goes through the toilet paper into your anus and feces.
"Damn-it! I was trying to wipe my ass and my finger broke through the toilet paper! I got a nasty case of Danger Finger"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."