Neurotypical or "NT" is an adjective of not displaying or characterized by autistic or other neurologically atypical patterns of thought or behavior. Basically, it means someone who is not on the Austism Spectrum or is not horribly shy.
Vulgarly speaking, someone who don't give a fuck.
Neurotypicality is somewhat correlated with sexual success, more so in men than women.
The opposite of neurotypical is called neurodivergent or neuroatypical.