タメグチ

Casual use of short forms is very delicate in terms of age and familiarity.
In this video, Endo is trying to use タメグチ（same age speech, spoken in short form） to Hamada. You can see Hamada is really pissed off every time Endo uses タメグチ, which is shown in black, because Endo is much younger than Hamada（遠藤は浜田よりずっと若いから。遠藤のほうが浜田よりずっと若いから。）.

The video was deleted but I happened to download it as flv file. I uploaded it in eLearning Commons.