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1.
The Snooki-beast's mating call on the "It's a Jersey Thing" episode of South Park when she grinds and dry-humps anything that moves.
SNOOKI WANT SMUSH-SMUSH!
by crawdadsinyopants October 18, 2010
 
2.
The *awwww* feeling you get after people say something incredibly sweet or cheesy. Can be used as a substitue or in addition to "awwwwww".
When a friend says "He held my hand" you say "smush-smush".
by Morris February 07, 2005