mutt    dog

That does it!   I won't bear any more!

arsenic 砒霜

toss and turn     move restlessly from side to side (on the bed)

restlessly  不安地 慌张地

last minute fush   最后冲刺

flunk   fail

疲惫

I'm beat.  I'm bushed.  I am tired.  I can't keep my eyes open.

I've had it.

I'm exhausted.   Let's call it quits for today.  Let's call it a day.

butter up    flatter