American Slang >Hang out:this means to spend some time together Textbook English: Let’s spend some time together on Saturday. Slang: Let’s hang out on Saturday. >Chill out: this means to relax or unwind Textbook English: We should relax on Sunday and go to the park. Slang: We should chill out on Sunday and go to the park. “Let’s hang out at Starbucks this afternoon and just chill out!”