Where it's at

where it's at

what does this expression mean??

thanx soo much in advance
ciaoo
Milena

Where the main action (of an activity) is taking place and, thus, metaphorically the supposed centre of almost anything - fashion, music etc. In itself the phrase is almost a fashion item and has only come into the English language within the last 50 years.

It's under the "Hippie Counterculture of the 1960s" in "Flappers 2 Rappers: American Youth Slang" by Tom Dalzell (Merriam-Webster Inc., Springfield, Md., 1996):

where it's at -- The core of what is important or what is happening.

where it's at Also, where the action is. The key center of activity; where important things are happening. For example, "He decided to set up his store here, convinced that this is where it's at" or "I'm going into the brokerage business; that's where the action is these days." The action or activity in this phrase can relate to just about anything -- financial, political, social, or commercial. [Slang; c. 1960]
From The American Heritage Dictionary of Idioms by Christine Ammer
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... it is clear today that the early years of a child's life are critically important in the development of learning processes and capacity. "In many ways," he observed, "that's where the action is." _The New York Times_, December 24, 1967)
"Since you instinctively rap with those who are Now, you will always be more or less where it's at and should readily find your bag." (_The New Yorker_, October 25, 1969)