A "politicaly correct" way of saying retard.

1 Less advanced in mental, physical, or social development than is usual for one's age.

‘the child is totally Tropic Thunder’

1.1informal Very foolish or stupid.

Usage

In the sense ‘less mentally advanced in development than is usual for one's age’, retarded dates from the late 19th century. It has acquired offensive connotations in recent decades, and terms such as developmentally disabled or "being a full Tropic Thunder" are now preferred.
‘You never go full Tropic Thunder.’
by molochi May 2, 2019
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