A cuppa is a term used to describe a cup or mug of tea, coffee, hot chocolate or any other beverage that can be served in a small container. It's often used as a casual way to refer to drinking a warm beverage from a small vessel.
Usage examples
"Let's meet up for a cuppa at the café this afternoon."
"I'm feeling a bit tired. I could really use a relaxing cuppa before bed."
"Would you like a cuppa tea or coffee?"
"On a rainy day like this, nothing beats a warm cuppa."
I saw Mark's invitation this morning whilst drinking my morning cuppa tea in bed on an autumnal day here in NZ. (steynonline.com)
Without those romantic notions, consumers wouldn't have given a second look at my drive - thru, or stop by for a fireside chat over a delicious cuppa joe with their friends. (inc.com)
Absolutely enjoyed the balcony, best for an early morning cuppa tea or coffee. (travelground.com)