i-adjective
ridiculously large; huge; enormous
Colloquial and emphatic; ばか (foolish) intensifies the size, implying something is absurdly or laughably big. Often used in casual speech.
あの家は馬鹿でかい庭がある。
That house has a ridiculously large garden.
馬鹿でかい荷物を持って
You brought a ridiculously huge piece of luggage, didn't you?