Full Idea
Folk psychology is primarily intentional explanation; it's the idea that people's behaviour can be explained by reference to the contents of their beliefs and desires.
Clarification
'Intentional' states are 'about' something, with meaning and content
Gist of Idea
Folk psychology explains behaviour by reference to intentional states like belief and desire
Source
Jerry A. Fodor (Jerry A. Fodor on himself [1994], p.292)
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.292
A Reaction
Sounds good. To reject folk psychology (as reductivists tend to) is to reject the existence of significant intentional states which have causal properties