Ohio - Something strange, cursed, etc.
Fanum tax - Fanum is some guy who steals food, so fanum tax is when you're stealing someone's food.
Skibidi - From video of a singing head in a toilet or something. I don't think this really means anything, it's just an interjection, like innit. It's also literally scat singing, so that makes a kind of sense?
Baby Gronk - An 11 year old American football player. This is probably like skibidi, and roughly equivalent to tossing "pingas" into your sentence because it's a meme. Gronk is also used separately however, and is Australian slang meaning a thug, a moron, an unpleasant person... This one requires further research.
Rizz - Shortened from charisma. To rizz is to flirt, to have rizz is to have charisma, "game" if you will. The rizzler is someone who has rizz, or is attempting to display it.
Gyatt - Corrupted version of "god damn". Refers to a Sir Mix-a-Lot kind of butt. Also used in reaction to seeing one, sometimes as the full "gyat damn". Can be spelled with one or two ts.
L - Familiar to older generations in forms such as "take the L", used more flexibly as a shortened form of loss or loser in various contexts. See also W, for win or winner.
Gooning - Masturbating for hours, but as like a hobby/lifestyle? Hard to explain. A gooner is one who goons. Mostly used because "gooner" is a funny word and calling someone a masturbation addict is funny I think.
Sigma - Similar to L, an older term that gets used with more flexibility. Evolving out of ironic use of alpha male language, sigma refers to someone/something as the prime/dominant/Chad form, or being characteristic of that. Alpha is a level of intensity lower than sigma, but basically the same meaning. Like tiny and small. Beta is like sigma but the opposite, being called beta means you're a loser.
Mewing - Keeping your tongue pressed to the roof of your mouth to reshape your jaw. A mewing streak is how long you've been doing it I guess.
Looksmaxxing - Trend focusing on improving one's appearance. Like many of these, used to be an obscure incel thing before becoming a meme because it sounded funny, like calling people "soyboy".
Mogging - Dominating or outperforming others in some respect, especially being more physically attractive. To be mogged is to be the one getting outperformed.
Blud - Like bro or mate or dude. From Jamaican slang.
Bussin' - Extremely good; excellent.
Sussy - Re-extended form of sus, which is short for suspicious. Sussiest is the most sus. Also sussy baka is a thing, which literally means suspicious idiot but is more of a general funny insult. This is all tied back to Among Us.