You have no skills.
A very old urban term used by gamers in the mid 90'. First originated by GameFan magazine.
Your gaming ability is severely lacking.
Not up to the challenge
You just suck
"If you cant beat ____ (various game), your weak sause"
"This game is not recomended for weak sause players"
"You were too scared to talk to that girl? Golly gee are your weak sause Billy."