It's a Giles-ism for a super-duper kind of BAM BAM BAM. It was Lando who played it back to me once and I had to ask Mrs G if I used it a lot in everyday speech. Her answer was an emphatic yes…
holy crap ,,them jeans look the bollox,,by the time i gets em they are gonne be seriously used/abused,,but loved none the less,,cannot fekkin wait,,might have to buy meselfs a pair,,,hmmmmm,,now theres a thought,,,