hypo, v.² — Green’s Dictionary of Slang

hypo v.²

[ext. of use of hypo v.¹, i.e. to ‘inject’ the dice with something that helps the cheat]

(US Und.) to ‘load’ a pair of dice.

1939

W. Winchell On Broadway 21 Oct. [synd. col.] Chumps think a pair of loaded dice fall the same way all the time. Actually a pair of hypoed cubes may hit different combinations each time they’re thrown.

hypo v.2

hypo v.²