A question about slang

查一查先知，原來係 friends 裏面o既一句經典對白。根據呢個網頁 講：

Chandler 要搵一個裁縫，於是有以下對白：
JOEY: Why don't you go see Frankie? My family's been goin' to him forever. He did my first suit when I was 15. No wait, 16. No, 'scuse me, 15. All right, when was 1990?

CHANDLER: You have to stop the Q-tip when there's resistance!

Joey 懵到咁，Chandler就同佢講：「你用棉花棒（Q-tip）挖耳挖到野就要停啦！」字面意思係驚 Joey 蠢到挖耳膜都唔識停，實則指 Joey 咁o既智商都係諗唔到架啦，冇謂諗壞腦啦。

Q-tip is a well-known brand of cotton tips in the States. The Americans very often make up some terms, by including well-known brands, to narrate. Just like what Ross said in another episode of "Friends" about how Rachel taught Ben many physical jokes. I don't remember the exact words but Ross said that his toilet had been "SARAN" wrapped.

This slang was quoted in FRIENDS 劇集裡.
Q-tip = cotton-buds 棉花棒 for cleaning ear-wax

Ｑ－ＴＩＰ就是我们常用来掏耳朵的棉签，掏耳朵碰到了耳膜阻挡当然要停下了，
The meaning of this slang is 意思是你想不通就不要再想了，小心把你脑袋想破了．

當有抵抗"(反抗)時，停止用棉(花)棒 〉〉