The Collaborative International Dictionary of English v.0.48:
droopy \droopy\ adj. bending downward due to lack of tautness; -- of lines. Syn: drooping, sagging, slack. [WordNet 1.5]WordNet (r) 3.0 (2006):
droopy adj 1: hanging down (as from exhaustion or weakness) [syn: drooping, droopy, sagging]