A booty call is contact made to initiate casual sex. A booty call was traditionally made via a voice phone call. Now, a booty call can also refer to a text message, instant online message, social media communication, or email.
The definition of booty call expanded in recent years to include the meeting for casual sex that comes after the communication, as well as the person invited to engage in casual sex.
The term booty call came into popular usage in the early to mid-1990s.