1. some healthy or highly nutritious meal, consumed as first palate of a day
or
2. coffee and cigarette in the morning as well as
3. sarcastically paraphrasing the first drug use right after sleeping.
" This bowl of coconut-millet with fruits and tahini really is a breakfast of champions. "
" What can I get you, madame? " - *lights up a cigarette, reflecting the fire in her sunglasses* " Just black coffee, please. " - " Very well... BFOC it is. "