hassle (noun): a troublesome situation; something troublesome that interrupts one's normal routine.
"I know it's a hassle to complete this form now, but Mr. Rogershassle (verb): annoy; bother; interrupt one's normal routine.
needs it in his office by the end of the day."
"If you'd stop hassling me, I might get this finished on time!hit the books: study.
"I wish I could go to the movies, but I've got to hit the books."hit the hay: go to bed; go to sleep.
"It's late, so I guess I'll hit the hay."hit the sack: go to bed.
"I'm really tired. I think I'll hit the sack."
How come?: Why? (statement word order).
"How come you weren't at the party?"