Very broad northern (English*) for "bottle". The town of Wigan definitely has a really old-skool dialect where words like "bottle" and "kettle" drop the t's for k's and become "bokkle" and "kekkle" repectively.
Seems to have been picked up by Sean Paul when he "bokkles a moe" (drinks a bottle of Moët).
* Just Wigan?
Give us that bokkle y' dickhead!