"More kippered" means to be more tired or drained, especially after a strenuous activity or lack of rest. Synonyms for this phrase include "exhausted," "fatigued," "weary," "spent," "drained," "knackered," "worn-out," "fatigued," "burnt out," "depleted," "exhausted," "jaded," "pooped," and "dog-tired." These words describe different levels and degrees of fatigue, but they all convey the same idea of being completely worn out and needing rest. When used in context, any of these words will convey the message effectively and help communicate how tired a person is feeling.