The phrase "That Shit Bussin" is used mostly by middle schoolers or tik tokers. when someone says this you should not take this lightly. this means that what ever (he/she/they/ze/ve/xe/per/hir/attack helicopter) is talking about is VERY good EXTREMELY good. like a sip of water at 3:23AM. many will use improperly, only use when very very very good.
This type of Sh*t is one of many painful dumps, The pain from this dump is horrible. It feels as if you've got kicked in the tree and giggle berries. While Sh*tting.