The women of the St. Louis Lady Arm Wrestlers (SLLAW, and don't you forget it) are mad, bad and dangerous to know. The group grafts the performance element of professional wrestling onto the quiet and deeply intimate art of arm wrestling. What gets spun out the other end makes the Sylvester Stallone movie Over the Top seem like a documentary. SLLAW is theatrical, competitive and supremely feminine — it takes strength to be a woman in this world, and these hand-grapplers have that in spades. Tonight SLLAW presents its Royal Rumble at 9 p.m. at the Heavy Anchor (5226 Gravois Avenue; www.theheavyanchor.com). Admission is $7, and all proceeds go to NARAL Pro-Choice Missouri.