HowUDoin T.I? Nooooooooo it's not what you think....... He engaged in sexual activity with his wife kidz, during a visitation. Sorry False alarm, although many of you were excited! Ha.

T.I.'s wife Tiny confirms ... the two were in a room together during regular visiting hours at Arkansas State Prison when Tiny made like Michael Jackson ... and beat it.

According to prison guidelines, inmates are allowed to kiss and embrace at the beginning and at the end of a visit as well as hold hands -- but "the inmate’s hands must remain in plain view of Visiting Room staff at all times."

Tiny tells us T.I. was immediately reprimanded and sent to a "Special Housing Unit" -- which consists of more security and less freedom.

Tiny says she hasn't spoken to T.I. since the incident -- but she's hopeful she'll be allowed to visit again soon ... as long as she keeps her hand to herself.