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A fucken bra. For someone with big tits, or "Shoulder boulders".
"Hey, that girl just removed her boulder holder and I saw her norks."
av Grant Nicholas 12 mars 2004
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.
av thatguy011071 12 januari 2010
boys or mens cotton briefs underware
John was walking around in his boulder holders today.
av Deep Inurass 9 september 2005
Another term for a bra
"Mary was walking around the mall with her boulder holder hanging right out of her shirt."
av Browneyedgirl413 3 juli 2013