godan verb (-ru), transitive verb
do over and over; do repeatedly
Colloquial verb meaning to do something repeatedly, often with intensity or abandon. The verb stem before まくる indicates the repeated action.
See also: 捲る (まくる)
昨日はゲームをやりまくった。
Yesterday I played games nonstop.
He worked like crazy and finally got promoted.
godan verb (-ru), transitive verb
have sex repeatedly; sleep around
Slang, often vulgar. Implies having sex many times or with multiple partners. The katakana spelling ヤリまくる is especially common for this sense.
彼は毎晩違う女とヤリまくっているらしい。
I hear he's sleeping with a different woman every night.