A fucken bra. For someone with big tits, or "Shoulder boulders".
"Hey, that girl just removed her boulder holder and I saw her norks."
di Grant Nicholas 12 marzo 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.
di thatguy011071 12 gennaio 2010
boys or mens cotton briefs underware
John was walking around in his boulder holders today.
di Deep Inurass 09 settembre 2005
Another term for a bra
"Mary was walking around the mall with her boulder holder hanging right out of her shirt."
di Browneyedgirl413 03 luglio 2013

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