"And pray to God that the flood subside / Cause you gonna ..." (Lupe Fiasco – The Coolest) | rejected

Sub is referring to the need for a new God-like figure while you wait for god’s word and he doesn’t give it to you. Naturally you would lose faith and regain it when he grants your wish.

"I love the peace and I love the war" (Lupe Fiasco – The Coolest) | rejected

No it means he likes peaceful times but he is not afraid of confrontation at the same time

"With nose-plugs in now, I can smell the set-up" (Drake – 9am in Dallas) | accepted

It means it is so obvious that he can smell it even with nose-plugs in. Probably the reason it ended up in a rap.

"I should call it a night, but fuck it I can't resist" (Drake – 9am in Dallas) | accepted

He means that he should stop partying because its 9AM but he can’t resist the urge to keep partying

"Smart kids that smoke weed, honor roll" (Drake – 9am in Dallas) | rejected

I’m pretty sure he is talking about his OVO crew when he says “Smart Kids”. Just based on the line before.

"And they wearin' high heels, trip so we're on high hills" (Big Sean – High) | rejected

He might also mean “trip so were on high hills” as in they just smoked a huge L, and now they are High up the hill.

"And I love to see you fail, that feeling there is the shit" (Drake – 9am in Dallas) | rejected

I think he means that to fail makes you feel back down to earth and drake always raps about how he is human. So i think he feels good to fail to get back up.

"Fresh off a vaca' and already need another trip" (Big Sean – Don't Tell Me You Love Me) | accepted

Possibly a triple entendre.

1.Got back from vacation and needs another one.
2.“Trip” as in he needs to get high.
3.His bitch is trippin'

"At the bar givin' away more shots / Than G.I., G.I" (Big Sean – Big Nut Bust) | rejected

I think he may be saying “Jihad” because the jihad are known to fire shots at the sky and “give them away”.

"Then we're flying like the lotus" (Chiddy Bang – Rebel) | accepted

You’re both wrong. Flying Lotus is a production group that makes beats for rappers like Kid Cudi, Tyler, the Creator etc.