Speed dropping is a unique way to build up Entrecredits fast. It basically works by clicking an Entrecard ad on someones site, which takes you to the next site (most likely with a card), then you drop on theirs, then go to the next, closing out the windows previous when convenient.
This funny may be used to make someone aware of their potty mouth, i.e. when they're cursing (or cussing) more than they're talking. I use it jokingly :D