like crazy, keep doing (without a second thought), nothing but, on and on, do … all around, to do a lot of, one after another, all over, keep, everything, constantly, all the time
Structure
Verb[ます]() + まくる
Verb[て]+ Verb[て]+ Verb[ます]() + まくる
(*) Verb has to be volitional
まくる is also sometimes used as a noun using Verb[ます]+ まくり + だ pattern