A few bricks shy/short of a load humorous slang pejorative
This expression has many variants. "One" can be replaced with "a few" or a specific number "two".
Unintelligent, weird, crazy.
Mary is one brick shy of a full load to believe she can sell those worn-out shoes.
Do you think that I'm one brick shy of a full load if I say I can stop a running car with my hands?
Extremely stupid
Very stupid, or silly
Stupid or crazy
If you're off your trolley, your ideas or behaviour are crazy or insane.
This slang dates from 1960s.
Act in a way that is likely to cause problems for you
If you wear high heels for a long walk you're asking for trouble.