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1.
one of many vague, nebulous, meaningless marketing hype phrases with no prerequisites, rules or regulations required to differenciate between them.

see: hit, break-out/thru, smash.

they imply that the product is already in some way "successful" & therefore is deserving of your attention, because you the consumer are a follower & couldnt possibly find something interesting on your own unless thousands or millions or others had already experienced it & said it was worth your valuable sheeple time & interest.
After a decade long career, selling millions of albums and touring the world several times over, the band finally had a 'smash hit' that went to number 30 in the charts.
by metaball August 03, 2007
 
2.
A british magazine aimed at 10 year old girls and men with Boyband fetishs/addictions. Features 'hot pictures and gossip' about all the boybands. sometimes contains free gifts (gay porn/condoms with westlife on it/laminated poster.

Liam:I have to renew my subscription to smash hits!
Graham:Quick to the newsagents!
David:Today there's a pull out picture of Shane Warne
by Eisel Dier April 01, 2007
 
3.
something that is very successful
It was hard to believe that this video game was already a smash hit and that it was released only recently.
by Light Joker January 22, 2005
 
4.
a british magazine aimed at 10 year old girls. Features 'hot gossip' about the hottest pop stars. sometimes contains free gifts.
I need to go to the newsagents to get this week's smash hits. I hope it has busted on the cover, they are sooo hot.
by huh March 21, 2004