A girl can tell if a boy/girl may have a boobie crush on her if
A) the boy/girl is constantly looking at her breasts during a conversation
B) is caught staring at her chest if he/she is bored
OR C) if he/she is always talking to his/her friends about the girl in question's breasts.
Boobie crushes are common among high school boys.
"Yeah, it's probably just a boobie crush."
"True that. You're totally stacked."