Pissoffable

adj. Containing the ability to anger and/or annoy someone.

OR

adj. Describing a person who is easily angered and/or annoyed.

1.) My date stood me up again! How pissoffable!

2.) The chemistry test was very pissoffable! How dare the professor include material we hadn't gone over in lecture?!

3.) They say that new kid over there is extremely pissoffable...