You fecking pickle is a way to insult someone and confuse them at the same time. You are calling them a green bumpy wet object shaped like a dick. At the same time pickles taste good so...
Cameron Dallas is a fecking pickle, Shawn Mendes is way smexier. You fecking pickle, how could you even think that!? You know what, everyone expect Shawn Mendes is a fecking pickle!
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.