When two objects merge together creating one super-object.

Got the covid-19 vaccine

Melded (n.) - A complete fuck-up of life. A lack of common sense combined with regretable decisions familiar mostly to the state of drunkeness while being stoned.

Melded (v.) - To do something so retarded that afterwards there is no answer to questions such as "Why the hell would you do that" and "How did you manage that one".