A term made up by some dude that's named Jose, "pulling an usher" is when you or anyone else was talking to someone, or trying to date someone for that matter, and they forget their name. They would also mix up their name horribly.
This term was originated from the fact that famous rapper "Usher" forgets the names of most of his bitches.
Dawg #1: "Yo how is you and that girl doin?"
Dawg #2: "oh we been chillin, you know the vibes"
Dawg #1: "What's her name again?"
Dawg: #2: "I think it's uhh..."
Dawg: #1: "dude don't tell me you forgot."
Dawg #2: "nah it ain't like that-"
Dawg #1: "aw hell naw bro pulling an usher"