bimbo

1 dated slang, usually disparaging :  man, fellow … no recently engaged bimbo cares to discover that he was not the little woman's first choice. — P. G. Wodehouse

2 informal, usually disparaging :  woman … evidence of how her hubby's been cheating on her with various bimbos — Dan Greenburg; especially :  an attractive but stupid woman We didn't want a blond bimbo in that role … we wanted her to be smart. — Hugh Wilson