that quiet kid that always gets left behind especially in dangerous situations

the whale tail is the shape formed when a g-string rides up high over a womans trousers

A timmy is that one kid to break something at a party. He spills his drink at every dinner. If there is fire around, he will put his finger in it. If there is a knife around he will start cutting things.

Timmy is an average kid who no one understands, his mom dad and baby sitter all give him commands

Refers to a result of plus 2 to par (or worse ) on a golf hole (aka double bogey, triple bogey, etc.). Also, a player who has 3 or more putts on a hole has committed a Timmy.

Origin - Timmy is a guy that bailed on a golf commitment in the 11th hour. A scoundrel.

From South Park cartoons, a kid who is mentally handicapped.
retard

A reference to a mentally challenged south park character who is only able to say his own name.