auxiliary N1 uncommon casualwritten
〜まくる — to do ~ vigorously, relentlessly, or over and over
〜まくる ・ まくる
Builds on 連用形（ます形）
A full written guide for 〜まくる is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See 〜まくる in real sentences
Jengo shows 〜まくる the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.