Brain Surgeon I'd Like to Fuck. Similar to a MILF, except the party is a brain surgeon. Maternity is optional.
Butters: I just heard on the radio that one of the Titans cheerleaders is a brain surgeon
Jsox: Yeah I saw a picture of her on google, she's a real BSILF
when someone gets really drunk on a wednesday night after giving blood (double red), and someone else gives him a hard time for it. a friend would reply "But Wednesday Is Like Friday," (BWILF) man.