It means “I love you so fucking much but I know you probably don’t love me back” is usually used to tell someone you like them without actually telling them.
Stands for "I hate you so much right now". Usually used when you hate someone at the moment of speaking and you want to inform him/her. Comes from the song Caught Out There performed by Kelis.
You are such lucky bastards every time we play table football! You win again?!?! IHYSMRN!!!!!!!!