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.