A genuine phrase that means you miss someone a great deal. You might say it to someone you love and have not seen in a long period of time. It is an endearing phrase.
Two people who are in love are living in two different countries:
Peter: "It feels like I haven't seen you in forever. I love you."
Amanda: "I know, I can't stand it. I miss you to pieces!"
Smashing stuff to pieces is the process of taking a bludgeoning instrument (or your arms) and combining them with some stuff (any stuff will do) to make pieces. The pieces usually fly everywhere. The stuff is now destroyed.
In a display of insurmountable, pansy-busting testosterone, Rowan grabbed the iron-clad baguette and started SMASHING STUFF TO PIECES. When he had finished, Paris Hilton's flat had been entirely demolished and the dust was still settling over once-sleepy Boringsville.