Agent Finn 

(n / adv) A (presumed fictional) independent opperative of legendary standing regarded for the ability to disappear and reappear in socio-tactical (frequently entheogenic) situations leaving no trace save cosmological contrails. Used to describe someone displaying these qualities.

"Where is Jimmy...he was just here?"

"He must have pulled an Agent Finn and gone for some pizza."

Agent Finn by Mike Bishop January 28, 2007