To blow smoke up one's ass. To lie. To tell a fib.
"Dude, I totally had sex with three girls last night."
"Man, stop smokestacking!"
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When someone puts their mouth directly over another person's butt-hole prior to a fart. The person then catches the fart in their mouth by inhaling the fart into said mouth. The end result is a person that looks like a bullfrog.
A: I'm about to fart.
B: I'm all about bullfrogging you...lay face down.
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