Original: Tweener a morally ambiguous wrestler, neither a bad guy or good guy (an inbetweener),  who will fight anyone regardless of alignment (e.g. Stone Cold Steve Austin, The Undertaker, Triple H, The Rock, and Kane).
Simplified: Tweener a morally ambiguous wrestler, neither a bad guy or good guy (an inbetweener),  who will fight anyone regardless of alignment (e.g. Stone Cold Steve Austin, Triple H, The Rock) and recently Randy Orton.