also: げんきもりもり
expression, noun which may take the genitive case particle 'no', na-adjective
full of energy; full of pep; bursting with vitality
Colloquial, cheerful expression often used about children, pets, or someone in high spirits. The モリモリ part adds a bouncy, vigorous feel.
See also: もりもり
The kids are all full of energy.
They greeted me with a beaming, energetic smile.