MY god i lovvee that song
although there are few words i didnt get their meaning but the ones you asked about here is what im sure they mean
تحفظ is like when u dont want to say something , i think its equivalent to (reserved in English)
for Example = انا اتحفظ عن الخوض في التفاصيل i dont want to talk in details
Yadh, means boy in Egyptian's slang which is short of ولد ( ياولد= يااد)ا
Habal means stupidity
على قفانا بياكلو عيش its a metaphor meaning that someone is taking advantage of someone else's misery or like when someone works hard and the credit goes to someone else
in this song he is referring to media representatives who speak in the name of the nation regardless of the nation's needs
الي يطبل يعيش whoever compliment things even if he didnt agree with , just to satisfy people, like when the employee compliments the boss just because he is afraid he fires him
يطبل تطبيل literally means using drums (drumming) , so people who compliment their bosses are like drumming to please them
yes skitch means scenario and he means that same things are repeated all the the times
good choice man, this band is amazing i recommend to u their song ( كل حاجة بتعدي )