ladt
A ladt is a guy who looks like a girl but isn't. He acts like a girl until he starts talking and says something dumb.
He wore a dress to school, but when he said, 'I'm a girl,' his friends laughed and said, 'You're a ladt.'
He wore a skirt and a blouse, but when he told a joke, everyone said, 'He's a ladt.'
He came to the dance in a dress, but when he said, 'I'm a guy,' the girls groaned.