Fucking a chick in the ass, then pulling outyour shit covered dick, and wiping it above her upper lip. Giving her the look of a "hitler stash" or in this case a "Shitler Stash".
"SNITLER"-when a man with a moustache or a beard sneezes leaving snot residue directly below the nose in significant amounts makes a mans moustache appear hitler-esque so snot/ hitler snitler