If you're in a truly fucked situation. You're better off leaving your lane to rot and roaming before you become a cheeseburger.
SoloQ is used to the losing top to continue losing, and laughing at the 0/6/0 top champion that is now 4 levels down and 60 cs down trying to defend a turret he can be dived over and over at.
However, nobody expects the random as top ganking mid with the jungle, securing dragon, and 5 man ganking bot lane and getting both mid and bot and dragon + getting enough assists/kills to swing back around, and possibly two to three levels out of it all.
sometimes the best way to avoid snowballing a champion is to simply not be around that champion.
you see this the higher you go up from the likes of top laners with very strong gank potentials like Riven. Riven is usually death for most mid laners if she catches them off guard, because she can double cc + burst + ult them if they try to dash or flash away. So, when she IS MID, or ganks mid, the mid is 90% guaranteed to die.
Also, if you wish to see an example. One of the Xin Zhao matches of mine on LoLking had a Riven vs Garen.
She died 3 times to him and finally said fuck it and roamed like I told her to. We proceeded to 3 man gank Yasuo, along with catching the jungler off guard forcing Garen to tele into the fight and die, and just proceeded to rapidly snow ball Riven and Velkox. Just by doing that, Velkoz and Riven both went from losing to snow balling. From there we systematically eliminated bot and mid and secured every dragon and ended the game before they could retaliate.