Bad mixer singular noun
Use to describe a person who is not good at talking with other people
As a bad mixer, I find it difficult to communicate with customers.
As a bad mixer, she always feels unconfident to join the party.
A non-alcoholic drink that is badly mixed with alcohol
I think milk is a bad mixer with alcohol.
What are some bad mixers for vodka?
Plural noun: bad mixers
The origin of this expression is not clear.
Someone who is totally bad at doing something.
Mary really can't sing for toffee.