It is what you call a gay brother. As he likes dick in his ass. It is a term of endearment.
Yo dickass, can you pass the salt?
A person who acts like they have a dick in there ass 24/7.
Tristan has been such a Dickass today.
Used to describe someone who is being an asshole and/or a giant dick. Typically used when you can't think of anything else as an insult at the moment.
John: U moma have smol peepee
Jake: Yeah fuck you too, dickass.