Definitions
1.NounA person's buttocks; the bottom, the backside. Also: the anus; the rectum.
2.NounA stupid, pompous, arrogant, mean or despicable person.
3.NounUsed in similes to express something bad or unpleasant.
4.NounA person; the self; (reflexively) oneself or one's person, chiefly their body; one's personal safety, or figuratively one's job, prospects, etc.
5.VerbTo be silly, act stupid or mess around."Stop arsing around!"
6.InterjectionAn expression of frustration.