Where it is said
- the Northeast· more common here
- Pernambuco· also used here
How it is used
A Northeastern way of calling someone dopey or dim — 'deixa de ser leso' is a scolding between friends or from a parent. Mildly insulting, so keep it to people you know.
Examples
Deixa de ser leso e presta atenção!
Stop being silly and pay attention!
Ele tem um jeito meio leso de falar.