It's a shanty that I'm remembering from some years ago. My recolection of the lyric is ...
"We'll rant and we'll roar like true born young whalermen
We'll rant and we'll roar on deck and below.
Untill we strike bottom between the two sinkers
then it's straight up the channel to Hoskar we'll go"

Can't guarantee the spell of Hoskar, but I believe it to be a whaling port in South America.

Striking bottom between to two sinkers is sounding depth to confirm that the ship is in the channel.