Colloquial euphemism for feces, literally 'the big one'. Often used in informal conversation, especially with children or in casual settings.
See also: 大便
The child said, 'I did a number two.'
I took care of number two in the bathroom.
Standard colloquial spelling using ほう in kana.
Alternate kanji spelling for ほう; less common in this colloquial expression.
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).