A word that I learned from my student

Yesterday, I encounterd a word I didn't know in my class. A student asked me about the word below. She was writing a sentence like below and asked me a question about it:

I want to go to the shopping mall. I want to gallivant there.

I understood what she wanted to say, but I wasn't sure if this is the right sentence because I didn't know the word to "gallivant." Now, I looked it up and the meaning is below:

gallivant (v.) to wander about in search of amusement or pleasure.

Actually, I express the same contenct in this way:

I want to hang out in the shopping mall.

Anyway, I still need to work on my vocabulary. And recently, I feel that many words I learned during the three years in the US are away from my head. How forgetful I am!