A sexual act with someone who is ashamed to be associated with you in public. This is distinguished from prostitution or selling your body as you are so low on the food chain that the person seeking you for sexual gratification is unwilling to pay you for your services. Booty calls serve the desperate; i.e., individuals that cannot manage to convince another human to have sex with them on a regular basis.
Of course he likes me - he is just afraid of commitment because his ex cheated on him. Think about it - why would he take time out of his/her busy schedule to look me up for a Booty Call when he has time to stop by? We can't go out in public because he doesn't have time/money/freedom (insert excuse here) to take me anywhere. He won't let me take him out because he is too old-fashioned and has too much pride to allow me to pay for a date.