To sparta kick is to like drop kick someone, or you can like kick really hard into their butt or back. When you kick you yell out "FOR SPARTA". It came from the movie "300" when King Leonidas kicked the messager guy into the hole. For about a day it was known as "Yar Kick" to add epicness.
Denay: *putting stuff away in locker talking la la la la*
Andee: *lifts up leg and yells out*For Sparta! *kicks Denay*
Anna: oh my gawd i am going to sparta kick denay after lunch she got my ass like 5 times today
Angel: hahahah okay what ever anna