a bum is part of our bodies but we call them ass. that's where our poo and wee comes out. and maybe if your going through puberty something else.
boy: WOW. THATS A NICE BUM
girl: oh thanks.
"Bum":
A colloquial term used to depict an individual who consistently demonstrates a lack of skill or proficiency in various areas. This term often denotes someone who falls short in their abilities, whether in specific tasks, sports, or general competencies. It characterizes a person as unskilled, inexperienced, or unreliable in performing certain activities or tasks, conveying a sense of inadequacy or inefficiency in their pursuits.
"Joe is a bum, particularly a stinky one; I can smell him from across the classroom."
Bro has women paying for all his sh*t, can't handle his business with his kids, and breath stank like bv.. bros a BUM.