The boomer slang equivalent of "wig" is "fab."
Fab is just short for fabulous.
"That outfit you wore yesterday looked fab, darling."
"I love that hairstyle, it looks fab."
Source: Merriam-Webster
Big Yikes: "Big Yikes" is a more intense version of the word "yikes." It refers to something that is so very embarrassing that another, much larger "yikes" is needed.
"I thought I was posting it to my finsta but it went to my actual account."
"YIKES."
"Even worse: Now she knows I was with her boyfriend last night."
"BIG YIKES."
Source: Urban Dictionary
The boomer slang equivalent of "big yikes" is "bummer."
"So you can't come? That's a bummer, man."
"Wow, total bummer. Why would he say that?"
Source: Merriam-Webster
Salty: To be "salty" is to be annoyed, upset, or bitter, usually about something minor.
"You look really salty right now. What happened?"
"I'm mad salty right now though, lowkey."
Source: Urban Dictionary
The boomer slang equivalent of "salty" is "ticked off."
"Why are you so ticked off today?"
"If I'm acting a bit ticked off today, it's because I am."
"You are ticking me off."
Source: Merriam-Webster
Lewk: "Lewk" is a variation of "look," a signature physical trait, or a specially and carefully constructed outfit or appearance.
"Their dress at prom was a lewk."
"Did you see Megan Thee Stallion's lewk in her newest video?"
Source: The Cut
The boomer slang equivalent of "lewk" is "decked out."
"Suzy was decked out at the party — did you see her?"
"You look all decked out today! What's the occasion?"
Source: Dictionary.com
Go Off: "Go off" can be used to encourage a choice, or to support a rant or ridiculous behavior that's already occurred, usually meant humorously. Often, the phrase "I guess" follows it.
"You sat there for five minutes trying to tell me how to live my life, meanwhile I have yet to see you get yours together. But go off, I guess."
Source: Urban Dictionary
The boomer slang equivalent of "go off, I guess" is "don't flip your wig."