Bookmarked, Brainmarked, Stainmarked. In reference to a good porn site or hot girl who you'll be remembering later on.
Yo you see shawty over there with them big titties and big ass... bbs... b.b.s.
Derek: "Yo Kirov! How was that girl last night?"
Kirov: "Damn! Her bb was incredible... Up until I saw that huge cock underneath..."