A thing a guy says usually attractive and gets many women and when he says "Yes I just added her to my bootie bank" that means he just added her to his women bank just like you add money to you're bank.
Joe: Hey jack did you have fun with that girl last night ?
Jack: Yes, I totally added her to my bootie bank.
Someone with HIV or another type of disease. Most often caught sexually. This could include any vast array of sexual diseases or anything that can spread during sexual activities.