What is a kinkajou?

From wikipedia:

The kinkajou (Potos flavus) is a rainforest mammal of the family Procyonidae related to olingos, coatis, raccoons, and the ringtail and cacomistle. It is the only member of the genus Potos and is also known as the "honey bear" (a name that it shares with the sun bear).
Kinkajous may be mistaken for ferrets or monkeys, but are not closely related to either. Native to Central America and South America, this mostly frugivorous, arboreal mammal is not an endangered species, though it is seldom seen by people because of its strict nocturnal habits.

Kinkajous are sometimes kept as exotic pets. They are playful, generally quiet, docile, and have little odor. However, they can occasionally be aggressive. Kinkajous dislike sudden movements, noise, and being awake during the day. An agitated kinkajou may emit a scream and attack, usually clawing its victim and sometimes biting deeply.

Marvin Eriksen's first words in How I Met Your Mother

In the last episode of How I Met Your Mother (season 9 episode 13) the little Marvin Eriksen speaks for the first time in the TV-show. The little boy, hearing his father and the future Ted's wife talking, repeats an expression that the two are using:

"Shunk junk"

While junk is a synonim of garbage, I had no clue about shunk, so I had to look for it and according to the urban-dictionary

the term 'Shunk' has become synonymous with what one of a hygiene conscious persuasion would earnestly regard as a smelly, scruffy bastard. Its use originated from a family of smelly, scruffy bastards (with surname of 'Shunk') who used to live in the Sanfields area of Port Talbot. 

In the episode, Marshall, in an attempt to apologize, says that the actual first word of Marvin was "Mommy" :)