The Collaborative International Dictionary of English v.0.48:

dropkick \dropkick\ n.
   an act of kicking a football (as for a field goal) in which
   the football is dropped and kicked as it touches the ground.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

drop-kick
    v 1: make the point after a touchdown with a dropkick [syn:
         dropkick, drop-kick]
    2: drop and kick (a ball) as it touches the ground, as for a
       field goal [syn: drop-kick, dropkick]