big time

big time {informal} (on a large scale; to a great extent; to a very large degree) — очень, сильно, здорово, не слабо (как усилитель)

Example 1: She's into disco big time (= likes disco a lot). — Она здорово диско увлекается.

Example 2: He really owes her big time for everything she has done for him. (СIDI)

Example 3: This time he's messed up big time! — Он здорово дров наломал.

Example 4: "How was the interview?" "Terrible, I messed up big time."

Example 5: Your la-di-da attitude toward this case is pissing me off big-time. As is the way you’re handling this catastrophe, Mr. Expert. Now I’m starting to understand why people got so upset about Hurricane Katrina. (Patterson)

This can be used to with the meaning 'very much'- if you like something big time, you like it a lot.