Normally, a skateboarder will feel more comfortable using their back foot to push, while their front foot remains on the board. In the minority case of mongo-footed skateboarders, the opposite is true. Some skateboarders who do not push mongo in their regular stance may still push mongo when riding in switch stance, rather than push with their weaker back foot. Some well-known skaters who change between mongo and normal when pushing switch include Jacob Vance, Stevie Williams, and Eric Koston. Although its origins remain uncertain, it is widely believed that the term derives from the pejorative use of "mongoloid". BMX
In BMX, there is a de facto relationship between footedness and preferences of grinding position and of mid-air turning direction. The terms "regular" and "goofy" do not indicate a foot preference as in boardsports, but rather whether the riders footedness has the usual relationship with their grinding and mid-air turning preferences. For example, consider the following classes of riders:

right-footed riders who prefer turning counter-clockwise in the air, and grinding on their right
left-footed riders who prefer turning clockwise in the air, and grinding on their left.Both classes are of equal size and would be considered "regular". "Goofy" would describe riders whose trick preferences do not match their footedness: a rider who prefers to grind on the opposite side as do most is considered a "goofy grinder"; one who prefers to turn the opposite direction in mid-air as do most is considered a "goofy spinner". Few riders have either goofy trait, but some riders may have both.
Immersion may refer to:

The arts
"Immersion", a 2012 story by Aliette de Bodard
Immersion, a French comic book series by Léo Quievreux
Immersion (album), the third album by Australian group Pendulum
Immersion (film), a 2021 Chilean thriller film
Immersion (series), a webseries which test the concepts of video games in real life, created by Rooster Teeth Productions
Immersion journalism, a style of journalism

Science and technology
Immersion lithography or immersion microscopy, optical techniques in which liquid is between the objective and image plane in order to raise numerical aperture
Immersion (mathematics), a smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding
Immersion (virtual reality), the perception of being physically present in a non-physical world, created by using VR

Other uses
Immersion baptism, a type of baptism whereby the subject is immersed in water
Immersion Corporation, a haptic technology developer
Immersion heater, a kind of water heater
Immersion therapy, overcoming fears through confrontation
Language immersion, a method of teaching a second language in which the target language is used for instruction