look up any word, like sparkle pony:
 
1.
A fucken bra. For someone with big tits, or "Shoulder boulders".
"Hey, that girl just removed her boulder holder and I saw her norks."
by Grant Nicholas March 12, 2004
 
2.
What a female would use to hold up very large breasts, industrial strength.
Janice mentioned that her extra large breasts can only be held up by a boulderholder.

I think Janice's boulderholder is also bulletproof.
by thatguy011071 January 12, 2010
 
3.
boys or mens cotton briefs underware
John was walking around in his boulder holders today.
by Deep Inurass September 09, 2005
 
4.
Another term for a bra
"Mary was walking around the mall with her boulder holder hanging right out of her shirt."
by Browneyedgirl413 July 03, 2013