Can't do something for toffee British old-fashioned informal slang
Used for emphasizing someone who is totally bad at doing something
Mary really can't sing for toffee.
Watching her for 5 minutes, I realized that she couldn't dance for toffee.
Loren can't cook for toffee even though her mother is a famous cook.
Tommy can't paint for toffee.
The verb "can't" should be conjugated according to its tense.
This idiom is a slang and dates from the early 19th century. No report wrote about its origin.
Used when something unpleasant has happened that has spoilt what you intended to do
Oh, no, that’s torn it! I’ve left my wallet at home!