Schwalbe is a German word, because the Germans always do schwalbes. When players dive or fall onto the ground and they where not touched by their opponent they made a "schwalbe".
for example Figo and Matthaus make schwalbes very often
Actually it has a little bit of the opposite of diving, as diving is like going straight down. Schwalbe, in case you did not know, is a bird with very high air navigation skills. So doing the Schwalbe is the art of going up in the air a bit, like being pushed, and then sailing spectacularly to the ground. As, already stated, in Divo Inzaghi.