首先，你要了解中国男性喜欢自称老子，当他们感到上当吃亏的时候，就会感叹，坑爹啊。。。就是老子被坑了的意思。。。。

not exactly, it has a lot of meanings, to cheat, trick or put someone in a difficult position or you think others are not taking you seriously when you ask for sth, there are still some other situations you can use.

既然汉语是你的母语,怎么不百度啊,百一下不就全知道啦。:-P

this word comes from the forum of internet so NEVER use it in official cases. when someone does something which is not expected by you, you can say this word.

that means you are cheated by someone or something its popular on internet,we could say its internet language