Pummer

When someone opens a can or bottle but only drinks 1-2 sips then forgets it.
Only drinking a sip of a drink and forgetting about it.

Latin Potum-iners meaning Drink lazy

"Who pummed this drink? it's barely touched!"
"Dont invite the Smith's they're a bunch of pummers,they never finish their drinks!"
"My kids are huge pummers, they never finish their drinks!"