baka naman bobo yarn

used in describing people that have uncanny or gullible thoughts. Mainly used before he/she thinks of something uncanny or gullible thing to do, or after doing it.

Example 1:
Person 1: hey, i have a great idea! why don't we put toothpaste in bread so that we don't have to toothbrush anymore?
Person 2: bro... baka naman bobo yarn.

Example 2:
Person 1: *ate bread with toothpaste*
Person 2: bro... why you gotta do that? baka naman bobo yarn.