Not trying to smoke your salmon

When you aren't just telling someone what they want to hear, regardless of the truth.
When you're not praising someone to gain their favor or approval.
SImilar to: 'Not blowing smoke up your ass.'

Possible sexual reference, 'to smoke' is often used as a euphemism for performing oral sex, 'salmon' and other fish are often used to indicate a vagina.

Not trying to smoke your salmon, but I completely agree with you.
I just think that's a great idea, else i would have disagreed and called you an idiot.