From WordNet (r) 2.0 (August 2003) [wn]:
gimmick
n 1: something whose name is either forgotten or not known [syn:
dohickey, dojigger, doodad, doohickey, hickey,
gizmo, gismo, gubbins, thingamabob,
thingumabob, thingmabob, thingamajig,
thingumajig, thingmajig, thingummy]
2: any clever (deceptive) maneuver; "he would stoop to any
device to win a point" [syn: device, twist]