It does not matter how you do it. It's a Fecal Mustache.

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.

NO, a Dirty Sanchez is performed when a male fingers a female's ass and wipes the reminants on the female's upper lip. What you referred to below, when a male inserts his penis in a female's ass then transfers the fecal matter from his penis to the female's upper lip is the Dirty Rodruigez, the first cousin of the Dirty Sanchez. Don't feel bad though, they are commonly confused.

after having anal sex, the man pulls out his penis and wipes it across his partners lip, forming an authentic looking mexican moustache.

When two people are having anal sex and the man takes out his penis and rubs it on the women's lips forming a mexican mustache/moustache. (The growth of hair between the nose and mouth.)

When two people are engaged in sex, one person, usually the male, inserts their finger in the anal cavity of their partner, and proceeds to wipe particles of feces on the upper lip of their mate.

It is when you rub shit across your upper lip.