When a dude purposefully or accidentally stabs you with an erect penis through his pants. This usually occurs in crowded areas where people have to brush up against one another. Or inadvertently when giving someone a gives a prolonged bear hug or when spooning.
I can't bend over to tie my shoes in this crowded bar because I ll get will cockdaggered whether I like it or not from behind.
I can never spoon with my girl anymore when we sleep together because she wakes up cockdaggered in the middle of the night.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.