Found 2 items, similar to billyoh.
English → English (WordNet)
Definition: billyoh
billyoh
n : an unimaginably large amount; "British say `it rained like
billyo' where Americans say `it rained like all get out'"
[syn: 
billyo, 
billy-ho, 
all get out]
English → English (gcide)
Definition: billyoh
billyo 
\billyo\, billyoh 
\billyoh\n.
a large amount; British say 
“it rained like billyo” where
Americans say 
“it rained like the devil”. [British]
Syn: billy-ho.
[WordNet 1.5]