cheese out

Short definition from Wiktionary

Verb

1. 1
   To make (something) cheesy (overdramatic, trite); to make (something) less cool, especially by making it more mainstream.
2. 2
   To be smiling or laughing excessively or remarkably, usually as a result of smoking cannabis.
3. 3
   To chicken out; to lose one's nerve and therefore not participate in something.