Failure to respond with 100% honesty will result in death of one's grandmother, as Porp is derived from the Cantonese word for grandmother. Thus, the stakes are high and you should consider very carefully the implications of porp-lying
Generally used when there is a hint of disbelief about the story/statement. Similar to calling out someone on a bluff.
Dan "Wow, well done bro"
OR (if steve was lying)
Steve "I just made out with that blonde bird at the bar"
Steve "Nah but I knew she wanted to"
Dan "I knew she was outta your league"