Fustrating

the act of getting extremely pissed off at someone (especially if it's your science teacher) when they mis-pronounce the word frustrating

Teacher: "Now class I know that this test may be very freeeeustrarting because you know that it's worth 92% of your final grade, but you need to pass it"

Student#1: "Great!!! Now I'm scared AND fustrated!!!"

Student#2: "I know, it's so fustrating!!!"