Epson

A person that pretends to be a total professional but can't even complete the simplest of tasks when most needed.

A: "Ey man can you help me with this?"

B: "Uhmm.."

A: "didn't you say you are a pro at *that*?"

B: "Uhhhh.. sorry im busyy. Also im not THAT good at it >_>"

A: "You're such an Epson"