like billy-o(h)

Very aggressively, vigorously, or enthusiastically. Primarily heard in UK. We've been working like billy-o all month to get this finished in time. During the economic boom, people spent money on credit like billy-oh, with no regard for how they'd pay it all back.

like billy-o

very much, hard, or strongly. British informal

1995 John Banville Athena This skin tone is the effect of cigarettes, I suspect, for she is a great smoker…going at the fags like billy-o.

like ˈbilly-o

(British English, informal) very much or very enthusiastically: They worked like billy-o to get it finished on time.