The Snap! Glitter! is an expression used to convey several different emotions and feelings. It is primarily used to express joy or extreme happiness. It punctuates the end of a sentence to add a nice little extra sassafrass to your conversation. It's also used to express just your general sassiness when someone pisses you off. It is accompanied by the snap of a hand and the poof of a glitter with your hand. You have artistic license here.
"Honey, these shoes are on sale and they are just my size! Snap! Glitter!"
"These martinis are delicious, darling. Snap! Glitter!"
"When you sign my paycheck then I'll listen to you. Snap! Glitter!, bitch!"
"I'll cut you. Snap! Glitter!"