The abbreviation for a sexual position known as "Grab, Down, In", the position is commonly used in
kinky or
rough situations:
"Grab, Down, In" is
basically just manhandling whoever is receiving dick and an extremely rough style of sex
'Aye bro I heard you fucked
Kaylee last
night and people are saying it got
kinky'
'Yeah it did, it all started when Ii GDI'd her'