When your girl is on her period and the only way to get her off without coming up like a you just left a Gwar concert is to peek her panties down enough to still cover the rappel line, kinda like a meth head looking out some blinds, holding jiggers for some shadow people.
"My boyfriend refused to go down on me when I am on my period until Mike showed him how to hold jiggers, like a man, and tounge punch Satan's doorbell all fucking night."