dialect Britain : fish parings or refuse; broadly : any bits and pieces
"The biggest change is that the new iMac takes on some of the design ethos of the old eMac from all those years ago, featuring a bulbous back plate that hides all the gubbins but tapers down to an incredibly thin 5mm edge." – Stuart Miles, Pocket-lint.com, October 23, 2012
About the Word:
Gubbins originates in the language of cooking. Its ancestry includes words meaning paring, portion, and gobbet (meaning morsel).