mura mag tala

can be used for situations that'll make you say "what the fuck is wrong with you?" or "What in the hell are you doing?" but in a more passive-aggressive approach. Mainly used in present time.

*Person 1 bumps into Person 2, then just walks away*
Person 2: Mura mag tala.

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.