遣り逃げ【やりにげ】(n) (sl) (vulg) having sex with a woman and then breaking off contact with her (esp. after telling her that you love her); wham-bam-thank-you-ma'am; hit it and quit it; fuck and chuck
no lie, that entry is ver-batim. needless to say, my japanese vocabulary is expanding at a brisk pace... oh and i was searching for the japanese eqivalent to "sex" as in "male or female" not the knockin' boots kind...