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A state of excitation in the male gender effected by the constraint of a female's excessively large breasts bound by an overly constrictive bodice, brazier, or corset.

A linguistic blend of "irresistible" and "unstable."
"she was wearing a low cut shirt and a really sexy bra that made her big gorgeous tits irristeable"
by VerticalBlindsARattlin April 29, 2013
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