expression, noun
Colloquial euphemism for feces, literally 'the big one'. Often used in informal conversation, especially with children or in casual settings.
See also: 大便
子どもが「大のほうが出た」と言った。
The child said, 'I did a number two.'
トイレで大のほうを済ませた。
I took care of number two in the bathroom.
大便 is the formal medical term for feces, while 大のほう is a colloquial euphemism.
小のほう is the corresponding colloquial euphemism for urine (number one).
From 大 (だい, 'big') + の (possessive particle) + ほう (方, 'direction' or 'side'), literally 'the big one'. A colloquial euphemism formed by analogy with 小のほう (number one).