When three girls, usually friends, stand together in a triangle so close that their boobs touch. This happens when they are in a public setting like a party and they need to talk privately.
This can also be done on purpose for fun or as a joke.
"Hey girls, come over here. I have some great gossip!"
1.boobs that are not fully developed into round spheres 2.boobs w/ a firm pointed nipple(usually b/c their cold)
1.girl to friend- "EWW! that gurl should't b wearing that bathing suit with her triangle boobs."
2.guy to bro- "Damn!!! Look at that girls triangle boobs. She be looking fine in that shirt."