歌いまくる
1
to sing energetically;to sing with abandon
See also:
捲る (まくる)
最近いろいろあって歌えなかったから、今日は歌いまくった！
Recently, what with this and that, I haven't been able to sing so today I sang like there's no tomorrow!
Other forms
歌い捲る 【うたいまくる】