When two people are seen making out in a public area like a shopping mall or a park. Usually said when the two people can't keep their hands off each other and are constantly kissing each other.
Guy 1: Hey check out those two they can't keep their hands off each other I don't think I've seen them apart for one second.
Guy 2: T.M.P.D.A
or
Friend: Aah c'mon guys T.M.P.D.A can't you two keep off each other for one second there are kids about
PTD (post-Tour depression) is a common pathological ailment amongst young British students that are in a state of mental and physical recovery after a frivolous week of self-debauchery and entertainment. It is common and needs to be addressed by further alcohol consumption, extended periods of sleep or repeated crying.
I'm suffering from P.T.D, I can't get out of bed and all I want is some Sangria