Two knuckles deep refers to somebody who is digging for nose boogers while face to face with someone or a group of people, not hiding the event, letting everybody see the activity.
Victoria: Did you see that?!? Chad just went two knuckles deep!
Steve: Two knuckles deep?
Victoria: Yeah! He was digging for nose boogers right in front of us!
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A "cobra trainer" is a person who always one ups you by saying they also did it or did it better or did it more often.
Tammy: Stephanie is such a cobra trainer!
Tiffany: Why, what did she do now?
Tammy: I told her about my visited China and was giving her the highlights of my trip. She said she's also been to the same places and claimed to have been to many other.
Tiffany: That's possible.
Tammy: She's never even been to China!