A person who’s forever dropping stuff like their hands are greased up. If someone can’t hold onto a phone, a pint, or their own keys for more than two seconds, they’ve got butterfingers. Usually said as mild banter, not a deep insult. Honestly, it’s the go to label for any clumsy mate in the group.
"Oi, butterfingers, you’ve binned your phone again. Third time this week. Put it in your pocket, not on top of the chippy bag, you absolute muppet"