Random is the only way of describing "an event that does not occur often" without attaching negativity to it. For example, other ways of describing an event similar to random would be odd, unusual, strange or weird but all of those words suggest that the event was not good. Random does not give an opinion either good or bad, it just states a fact.
Plus, it is just a trendy word to say right now. Different age groups and generations have different trendy words and trendy words are also different in different areas. Like I live in a state where I here "that's legit", "I'm stoked", "that's epic", and "true story" a lot but in my hometown I never heard anyone say those phrases but I hear "that's random" a lot.
· 9 years ago