Definition & Meaning of "mugged by reality"in English

What does "mugged by reality" mean in slang?

The phrase "mugged by reality" means being suddenly forced to accept a harsh or disappointing truth after holding unrealistic expectations. The structure uses "mugged" metaphorically, implying an abrupt, aggressive confrontation by reality. It is often used when plans fail or assumptions prove wrong in an obvious way. The expression is informal and commonly used in online discussions and commentary.