adj. One who causes trouble, especially for others - a contraction of "shit stirrer".
Joey just lied to his older sister about nailing her best friend - what a shitster!
One who claims to be a hipster.
Dude, look at all thoes Shitsters and art fucks.
two best friends who become the equivalent of blood brothers, by reflecting on their lives and their shit while they take a dump in the stalls next to each-other...... a strong bond of friendship is formed and remembered whenever either shitster take a shit
M and M are becoming shitsters in the bathroom at barnes and noble by releasing their poop into toilets
A shitty sister. To be used in jest or maliciously.
What's up, ya shitster?