Similar to updog but more child-friendly and universally applicable. Updoc was made popular particularly in the 1940s-60s through its endorsement by Warner Brothers.
"updoc" is a verbal prank played on a naive or unsuspecting victim, based on the old Bugs Bunny greeting/catchphrase:
"ehh... What's up, Doc?"
"doc" (doctor) being Bug's idiosyncratic equivalent of "pal", "dude", "bud", etc.
The gag is intended to get the mark to repeat Bugs' greeting without realizing it, at least not right away. Mirth ensues among onlookers.
Historically, it precedes the current, and equivalent, "updog/updawg".
This word has no definition in any known language. It is soley used in the english language as a set up for a joke, relating to the common phrase "what's up?" And the referal to a person as "dog".
Person 1: "Ew, it smells like updog in here."
Person 2: "What?"
Person 1: "You know, updog."
Person 2: "What's updog?"
Person 1: "Not much what's up with you"
Person 2: *punches Person 1 for making such a terrible joke*
An immigrant is "a person who comes to a country to take up permanent residence." (Merriam Webster) According to the Department of Homeland Security, "A Green Card holder (permanent resident) is someone who has been granted authorization to live and work in the United States on a permanent basis. As proof of that status, U.S. Citizenship and Immigration Services (USCIS) grants a person a permanent resident card, commonly called a "Green Card.""
"Undocumented Immigrants" do not have a green card and have not taken steps to obtain status as residents of the United States and therefore they are not immigrants. The term immigrant is used as a way to mock people who enter the United States illegally as nonresidents.