Agarrar para el lado de los tomates
A phrase used to describe someone going completely off-topic, losing their train of thought, or fundamentally misunderstanding a situation. (In traditional Argentine houses, vegetable gardens were located at the far back of the property, and the tomato patch was typically the most distant point from the main living area.)
He started explaining what he covered in class and then just agarró para el lado de los tomates.
Automatically translated from Spanish