1. n. a person with very large buttocks. (Usually objectionable.) Some bigass came in and broke the chair when he sat down.
2. mod. pertaining to someone who has very large buttocks. (Usually objectionable.) Tell that bigass jerk to get out!
3. mod. pertaining to a person who is self-important, overbearing, or arrogant; pertaining to anything having to do with arrogance. (Usually objectionable.) Take your bigass ideas and go back where you came from.
4. mod. really big. Did you see that bigass SUV hit the little Honda?