src: oliverands.com
A kangaroo pocket is a type of pocket, usually featured on hoodies and sweatshirts, that is large enough to fit both hands into. The pocket is open on either side. Other names for it include muff pocket and hoodie pocket.
The pocket sits on the lower front section of the shirt. It is usually large enough to contain some personal belongings. The kangaroo pocket is most associated with casual clothing such as the hoodie or sweatshirt.
Video Kangaroo pocket
References
Source of the article : Wikipedia