To issue an unintentional fart (or series thereof) when laughing uncontrollably at an unexpected funny
moment. Importantly, this is not followed by "following through", which would spoil the moment, hence "no chunks". Often associated with ejecting
beer, etc from the
nose at funny moments.
HaHaHa..Frrt,frrt,frrt....I
just wasn't expecting that
punchline! Damn, I chuckled without the
chunks