Someone who is awesome an in posession of a very nie, firm, and reflective butt.
Geeze, did you see the way that ball bounced off her butt? It's like she literally has a Rubber Butt, and Damn she's fine.
by Rubber Butt June 23, 2008
When you sit on a field for to long and get turf up your butt
Donell was j-chillen on the field watching sports and when he stood up he had rubber butt
by Jadielady123 May 12, 2016