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1.
UK Slang A sweat cake is best defined as someone who always worries about everything and anything their girlfriend might not appreciate
Dom: Blad u comin out tonight?
Hussain: Nahh cuz, i ain't feelin it uno, probs jus gona chill with my girl
Dom: Ur sucha a F*"£&"* Sweat Cake ...
by Babalos May 30, 2010
 
2.
A person who wears make-up to the gym
"Hey, see that sweatcake over there? She looks like she's just come from the zombie studio and onto a treadmill"
by Words Wired Weird February 04, 2008