Мокруха literally means "wetness" or "dampness." However, in Ukrainian slang, it's a colloquial and somewhat crude term for "murder" or a "bloody crime."
In the context of the song, the line "Любов гірша, ніж мокруха" (Love is worse than mokrukha) uses this word in a provocative way. It suggests that the intensity and pain of love can be even more devastating or consuming than a violent act, highlighting the dramatic and all-enencompassing nature of the singer's feelings. This double meaning makes it a very striking and memorable word.
"Провела екскурсію 2.0" is a playful confession about falling hard, fast, and a little helplessly.
The singer describes a girl who has wandered straight into his heart on a "guided tour" without even realizing the effect she's having. He can't shake her: his heart is pounding loud enough that she could listen to it herself, he's losing sleep, and he's drowning in the thought of her.
Rather than sounding heartbroken, the tone stays light and a bit self-mocking, he knows he's completely smitten, head over heels, and he's happy to admit it, whispers and all.