Verb. The acting of ejaculating due to cuddling. See also, Cuddlerape.
Jason was cuddlecumming because he was cuddled up between Mandy and Jess.
Cuddles with sexual acts leading to an orgasm, not to be confused with cuddlefuck...
Like mouth and/or hands used to make your cuddlepartner orgasm.
"Did you guys have sex?!"
"No, we were only cuddlecumming."