Obstrompulous
So big and annoying you could make a mountain cry. People use it when they think they're being fancy.
My brother called my dog 'obstropulous' because it barked at the mailman and ate my homework.
My friend used 'obstropulous' in a text and I laughed so hard my phone fell in the toilet.
My math teacher said the problem was 'obstropulous' and I got confused and cried.