缺狗粮了才知道来找我
[quē gŏu liáng le cái zhī dào lái zhăo wŏ]
'You only think of me when you run out of food' employs playful imagery where dog food ('dog food' is used as slang here referring broadly to things needed), stands as a metaphorical placeholder for essentials. Suggests a feeling of being taken for granted or noticed primarily when others lack something they need or want.