A combi drill is a drill that does both drilling and driving. Drilling is the act of boring holes and driving is the act of fastening or driving screws. Combi drills are large, the size and weight of their internal mechanism reflecting the nature of their heavy duty work.
I'm not sure if I really want to admit this but I own a vacuum cleaner that has a massage attachment, surely that has to be the Mother of all weird combos!
p.s. I inherited said vac, and have never used it.