When a girl leads on a guy and then bails on any of the plans the guy has made would result in the term trail bail. Can happen to both sexes but mostly happens to men
Guy: Hey wanna hangout at the beach
Girl: No Im busy
<Guy phone calls to friend right after conversation with girl>
Guy: Hey this girl keeps leading me on but never wants to be together alone.
Guy Friend: It's because she is a trail bail and doesn't want you.
Guy: What a bitch