TECHNICALLY: It would send the bill back to the committee from whence it came and be instantaneously re-presented to the House, containing an amendment referenced within the motion.
IN REALITY: It's a last ditch attempt to amend the bill.
And IN REALITY if the Repubs do it right, and duh Dems vote to defeat the recommit, Stupak and pack will be painted as liars without any wiggleroom.