When your walking in a public place with your friends and you see a girl with nice full bodacious breasts. You wanna say something to your friends without alerting the big boobed girl, so you say "Damnnn looked at them tig bitties"
really means big titters, which means someone has nice breasts. Usually used by dudes in discreet way to talk about titties while in a social situation or in the classroom with out anyone being the wiser.