A phrase that beta-male cucks think is a funny way to say "no lie". In reality this is not a funny phrase and is not catching on.
Thought to be based on a show by the name of "Dave", created by rapper Lil' Dicky (a rapper whose name is a play on his... shortcomings), "On Dave" is commonly used by men lacking clout and/or dick game in an attempt to establish social dominance in a roguish and ape-like manner.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.