DIMP, much like LOL(ROFL, ROFLMAO, etc.), can be expanded to signify the amount of fecal matter that has occupied the users pants. Such examples would be DIMPWSLO (Deucing In My Pants With Some Leaking Out) or DIMPWSLORDML (Deucing In My Pants With Some Leaking Out and Running down My Leg)
However, it should be noted that is where the similarities between "DIMP" and "LOL" end. "DIMP" is the ideological antithesis to the cultural malignancy that is "LOL" and should not be used vapidly.
Kenzie: That's because they're dimps!
Carly: oh that explains everything