Off your trolley British phrase informal slang
I thought he was off his trolley when he decided to move out.
Everybody thinks I'm out of my trolley, but I'm pretty confident in myself.
Extremely stupid
Very stupid, or silly
A very offensive term used to describe an upper-class British man who is stupid or inexperienced
Stupid or crazy
To be extremely stupid; not to be alert
The expression came into use in the 1890s and is most likely related to the operation of a trolley. Trolleys operate by running along with electric cables above that attach to a metal arm on top of the cab. However, these arms sometimes lurch off the electric cable. Once disconnected from the electric cable, a trolley has no source of power.