When you say someone is a "MacGyver", it means that someone is really good at working with his hands (specifically with tools). It also means that the person is very creative and resourceful, especially in situations where tools and options are limited.
'LOL' is an abbreviation that means 'laugh out loud'. It was first cited in the year 1989 newsletter "Fidonet".
"Kvetchy" is a slang used to describe a person who complains or grumbles.
In contemporary usage, an 'influencer' is a person who has the ability and resources to influence potential buyers or customers. Influencers are commonly celebrities or personalities where their fanbase is key to reaching potential sales for the product or service they endorse.
'Hygge' is often associated in Danish culture where one is able to experience feelings of contentment and well-being. When used in a sentence, it can function similar to using the word "zen". Example sentence: "Why don't you let go of the past and bring more hygge in your life?"