Analogous phrase to "in love", to describe one's feelings for a person that one is interested in romantically but not currently in love with. As one can love another as a friend but not be *in* love, so can one like another as a friend but not be *in* like.
I think I'm in like with that girl we met last week.
In the song "Minnesota" by Lil Yachty he is referring to the ice (aka diamonds) on his jewelry being cold like Minnesota because Minnesota is a cold state and ice is also cold. Minnesota's record low temperature is -60 degrees F.
"Yo did you see how many diamonds were on that watch?"