Pulling a Stefan
Pulling a Stefan means to go AFK for a long duration without telling anyone. You can use it in practically any situation.
1. Declan: "Where the hell were you?! A squad of 4 just flanked me at the rendezvous point."
Stefan: "I had to go."
Declan: "Oh, so you pulled a Stefan."

2. Declan: "Where the faggot were you Josh?"
Josh: "I was pulling a Stefan."
Declan: "That doesn't really answer my question..."

3. Teacher: "And where were you Yesterday? You missed your English exam."
Jimmy: "I pulled a Stefan."