All I got on urban dictionary was
Fuck Bucket
4 up,
15 down
1.
A urn-like vessel for gathering, storing and processing a culmination
of various excretions (including, but not limited to, semen, sweat,
vaginal secretions, lubricant remnants, blood, saliva, pubic hair,
other waste product) derived from the execution of a sex act. Although
a definite insult, perhaps the more insulting is the “fuck bucket
worker” – cursed to spend her/his time removing the residue of others
with a sponge attached to a pole. Then squeezing the substances out of
the sponge into the bucket.
2. An insult suggesting that someone is as useful as a bucket full of the above substances.
That fuckbucket...
Or
As a general explicative similar to "damn": "Elaborate Japanese fuck
bucket!" (I image nice pictures and elaborate details all around the
urn-like vessel).