stuff·ing 
/ˈstʌfɪŋ/ noun
plural stuff·ings /ˈstʌfɪŋ/ noun 1 [noncount] : soft material that is used to fill a pillow, cushion, etc. 2 : a seasoned mixture of food that is put inside another food and cooked [noncount] ▪ Would you like more stuffing? [count] ▪ a delicious bread stuffing
knock the stuffing out of
informal : to cause (someone) to lose energy and confidence : to make (someone) feel weak or overwhelmed
▪ When he found out that he didn't get the job, it really knocked the stuffing out of him.
▪ When he found out that he didn't get the job, it really knocked the stuffing out of him.
