A trendy person.
"The trendy crowd gathered at the new speakeasy to hear live jazz music."
Of, or in accordance with the latest trend, fashion or hype.
"The new coffee shop is so trendy that everyone wants to take photos there before it becomes too crowded."
In plain English: Trendy means something that is popular and stylish right now because everyone else wants it too.
"That new coffee shop is very trendy, so we had to wait in line for an hour just to get inside."
Usage: Trendy often carries a slightly negative connotation of being fleeting or overly influenced by current fads, distinguishing it from more enduringly stylish terms like fashionable. Use trendy when describing something popular for only a short time rather than something classic.
The word trendy comes from adding the suffix -y to the noun trend. It entered English as a natural formation to describe something that is currently fashionable or popular.