acronym and euphemism for the phrase "Jacked and Tan" or someone who goes tanning frequently, wears limited clothing when working out, and emits a high level of personal vanity. Most "JNT" people are dbags who are very successful in picking up women, others such as metro sexual or Euro-esc or Euro-trash people get "JNT" to look good constantly.
Todd: "You coming over for the game tonight?"
Scott: "I'll be over later I have to get JNT if there's chicks there"
Todd: "You're looking a little weak there"
Scott: "I've been busy, haven't been able to get JNT lately"