It's a combination of "grub" and "rubbish", making another word for junk food.
I don't feel like cooking tonight. Let's just go out and pick up some grubbish.
ayon kay luckysocks113 ika-06 ng Agosto, 2014
Can you define these popular missing words?
A mix of garbage and rubbish, usually in the context of source-code.
Fix that routine- it's absolute grubbish.
ayon kay Rev. Five ika-25 ng Mayo, 2005