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!!!"