When a lady’s partner is performing cunnilingus & they are terrible & have no flippin clue what they are doing, she will give them a tap on the shoulder, letting them know they can just give up. The Shoulder Tap means there is no chance in hell she was going to cum & she’s bored & likely irritated. She will likely never call them again.
Kelly: How was your night with Ruben? How was that tongue down there?
Jill: Horrible. He had no damn idea what he was doing, so I gave him the shoulder tap so he’d just fuckin quit already.
When a male's penis is large enough it may touch the toilet bowl or water while taking a number 2. Instinctively your first reaction is to move your penis back instantly resulting in a toilet tap.