G7 (or G sev for short)is he hottest of three degrees of hotness, followed by Y11 (do-able), and O8 (straight nasty). G7 is like instant-boner hot. To be considered G7 is a high honor, and only a select few are worthy of this title. Although G7, Y11 and O8 are mainly meant for rating the attractiveness of a woman (or man for you ladies), it can also be used to describe one's talent or skills in a certain area, such as sports or instruments.
playa 1 - mmmmmph did u just see that fly beezy walk by?
playa 2 - yeaa dawg she was G7!!!
Playa 1 - yea sonn, but look at dat O8 behind her!
playa 2 - naaaaaaaasty!!
noob - dang that nig is a G7 baller!