Ass means the buttocks/posterior, although it can include the anus (as in 'asshole '). It is also used as an insult towards someone who is idiotic or a fool.
Here is a list of phrases that use the word 'ass', followed by their meanings:
- Badass - Tough/cool
- Dumbass - Idiot, fool
- Kick ass - Fight, or just generally be great/awesome
- Kiss ass - Someone who shows too much respect for someone of higher authority, perhaps for a reward, e.g. an employee might do this to their boss -metaphorically, of course.
- My ass - When placed at the end of a statement/word, it means you don't believe it, it's a lie, e.g. "Simple, my ass!" means you don't see it as simple, it is clearly difficult.
Similar words and phrases: