oot means to boom a nigga its related to the noun form oota which is a nigga that kills
"yo bro who that"
*nigga turns around and pops a nigga runnin up*
"hold up bruh its cameras all around"
-"aight u just wanted me to kill him or sumn?"
"yo bro yk thats involuntary manslaughter nigga??"
-"ok"
"now we all gon get locked up because u wanted to oot that nigga bro"
-"fuck it lets get sumn to eat or sum"