GR translation: throatback

[Mike Jing]

V669.39-670.7   . . . and others are watching: the woman who tells everyone
that Thanatz molests her little girl at night (Thanatz can never meet her
eyes because yes he wants to, pull down the slender pretty pubescent’s
oversize GI trousers stuff penis between pale little buttocks reminding him
so of Bianca take bites of soft-as-bread insides of thighs pull long hair
throatback Bianca make her moan move her head how she loves it) and a
beetlebrowed Slav too, who has forced Thanatz to go hunting cigarette butts
for him after lights out, to give up his sleep not so much to the chance of
finding a real butt as to the Slav’s right to demand it . . .

What's the meaning of "throatback" here?
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