This is the 6757th most frequent Japanese word.
ビックマック
"ビックマック" means "Big Mac," a hamburger sold by McDonald's.
Here, 'ビックマック' is used as a noun referring to the specific type of sandwich known as a Big Mac by McDonald's.
私は昼食にビックマックを食べました。
I ate a Big Mac for lunch.
In this sentence, 'ビックマック' is the subject referring to the general concept of a Big Mac.
ビックマックはとても美味しいと思います。
I think Big Mac is very delicious.
Here, 'ビックマック' is again referring to the specific item, highlighting an ongoing action or habit.