肥爷爷用英语怎么说

"肥爷爷" 是指一个身材肥胖的老男人。在英文中，可以用 "fat grandfather" 或 "obese grandfather" 来表示这个意思。
"Fat" 是英文中常用的形容词，表示 "肥胖的"。"Grandfather" 是英文中常用的名词，表示 "祖父"。
例句：
My fat grandfather always eats too much at Thanksgiving dinners. (我肥爷爷在感恩节晚餐时总是吃得太多。)
My obese grandfather has trouble walking because of his weight. (我肥爷爷因体重超重而走路困难。)