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like a slice of marble loaf 

-This linear algebra lecture was like a slice of marble loaf
- I thought you said it was okay
- Exactly

A Few Slices Short of a Loaf of Bread

Somebody who's not quite mentally competent
Similarly you may use the phrase, a few fries short of a happy meal
Weird Bus Dude: Hey wanna be my friend????? (waves spastically)
B: Can't Say I do
S: Well that guy is a few slices short of a loaf of bread!