Dictionaries:

weak sister:

Pulp fiction slang for a push-over , a woman who easily gives in to sexual temptation or readily acquiesces to having sexual-intercourse .
See Also: adelphepothia, Browning sister, bub and sis, Freya, girly-mon, kid sister, pantywaist, sin-twister, sis, siss, sissies, sissy, sistie, skin and blister, sobbyist, soror, sororal, spanner, warme schwester

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