batwing

Short definition from Wiktionary

Noun

1. 1
   The wing of a bat, or its shape.
2. 2
   Several South or Southeast Asian species of tailless dark swallowtail butterflies in the genus Atrophaneura.
3. 3
   An area of flabby fat under a person's arms.
4. 4
   A long sleeve with a deep armhole, tapering toward the wrist.
5. 5
   One of a pair of swinging doors which typically do not lock nor cover the full vertical range of the doorway (leaving a large gap at the top and bottom), common especially in saloons.
6. 6
   A heart-shaped rollercoaster feature with two inversions.
7. 7
   An exercise or posture on the stomach wherein a dumbbell row or lateral raise is performed.