One that tries at any length to get some kind of action from the opposite sex. There are many levels to this. The lowest level would be 1 (chiggapup) The master level or level 10 is considered to be "The Pure One"
Bob became a level 7 chiggamite after getting Susan to strip for him.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.