The grandfather “greedily washed himself”, which means he ate too much.
He ate three portions that were originally supposed to belong to his grandchildren.
This story can be humorous in that it shows how the grandfather took the opportunity and eagerly enjoyed a portion that did not belong to him.
Possible interpretation 2: Pun on the word “seconds”
Alternative meaning:
If we understood the word “seconds” as units of time (for example, seconds as an interval of time), the sentence would take on a completely different, absurd and humorous meaning. For example, it would mean that someone “ate” seconds of time, which of course is not possible, thus creating a playful absurdity or a joke.
Conclusion and additional notes:
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