Favorite way to say "He/she's kinda slow or not all there"?

I am so glad I started this thread. This stuff is gold, Jerry!

I have been getting great milage combining many of the others:

Not the sharpest beachball in the cookie jar.

Give the Sister a high five. That rocks.

Obtuse

The one I use most is “Dumber’n a box of retarded hammers.”

You can imagine the expressions on the two or three students she told this to. :eek:

Dumb as a box of rocks!

Phelpsian

He’s doing a heck of a job!

“Strong like bull, smart like tractor.”

*He…

…doesn’t have both oars in the water.

…is a few eggs short of a dozen.

…is few french fries short of a Happy Meal.

…is about as bright as a small appliance bulb.*

If brains were dynamite, he/she wouldn’t have enough to blow his/her nose

The cheese has slid off his cracker.

He’s new.

I like that - it’s kinda like the official Southern phrase for “moron”: “Well bless your heart!”

Foghorn Leghorn has at least three per episode:
He’s so dumb he thinks a pig pen is something to write with.
He’s about as sharp as a pound of wet leather.
etc.

He ain’t right
Stupid like a football bat

He’s a few bricks short of a full load.

Oh! I have a Foghorn-ism from one of his cartoons:

Note that the “eeww” part must be said while screwing up your face into a silly expression - at least that’s how our Foul-Feathered Friend did it in the cartoon!

I say “in the crib.” No one else does.

He’s a bit touched.

(However, this is usually used for people with genuine intellectual disabilities.)

He’s as useful as a three-legged dog with its ass shaved.

I have no idea what that’s supposed to mean, but I heard it from a co-worker wrt another co-worker, and it stuck.

or “Reeeeal nice fella”