ศาลาชุมนุม

[copy]

Do you often add the word พี่ at the end of sentence to refer to the bartender?

When he or she is older than me, yes.

[R.E.G.]

Do you often add the word พี่ at the end of sentence to refer to the bartender?

Not in my experience, almost certainly not in a bar with such limited supply of beer. Neither would I expect the barman to say 'what will you have today'
I imagine this is the doctored subtitles from a film.

[mikenyork]

อยาก also has a sexual meaning--it is the informal word for sexual desire or arousal so adding the verb specifying what is wanted is important