Meaning of cheese up | Babel Free

Definitions

1. To add cheese to; make cheesy or cheesier.
   slang, transitive
2. To smile widely; to crack a huge grin.
   intransitive, slang

Examples

“"No, just get over here. You need to try this one!" she exclaimed as she cheesed up a chunk of bread with one of our blues. Angeline stuffed the open faced mini-sandwich into my mouth […]”

“I cheesed up at his perfect fucking face.”

CEFR level