Pay it forward is an expression for when the recipient of an act of kindness does something kind for someone else rather than simply accepting or repaying the original good deed.
In Latin-American Spanish slang, a papi chulo is an attractive man. While the term originally names a pimp, it has broadened to refer to a ladies’ man.
Ywn or >ywn is an internet acronym for “you will never,” usually used to introduce specific life experiences someone longs for but feels they can’t have.
I swear is used to make an oath of honesty, particularly in legal settings. In less formal use, I swear is used for emphasis or exaggeration when sharing something exciting, frustrating, or hard to believe.