She was at a sex party, Angie is "influenced", has a good mood and a full belly from all kinds of drinks. Angie laughs and staggers a bit because her head is "bubbley". She's sweaty, has hiccups, and burps constantly. Angie has a hangover and drinks sparkling water all the time, her belly is already full, but she has to keep drinking and drinking. That's why she can't stop burping.