The use of the word "word" as acknowledgement

I don't like it.

Idiots that take up my time.

The other day, I bought lunch at a very busy cafeteria-style lunch place that I love. There's always a line to pay, so when I got to the front of the line, starving and excited to eat my delicious food, I was in a hurry. The cashier rang up my lunch and I handed her my debit card. She then informed me that someone was using the phone, so I'd have to wait. Meanwhile, so did everyone else in line. For 20 mins. I wasted half my lunch break while some employee in back was having a personal conversation on the same phone line as their interac machine. Seriously. And she wasn't apologetic about it, she was rude. Bitch.