If someone has spank you, then such dream symbolizes your childish attitude towards some things. If you were the one who spanked someone, then it means that other people annoy you.
Dream dictionary: spank dream meanings
Dreaming that you whip someone means that youll find peace in your marriage, if youre married. For single people it usually means happiness in love. Dreaming that you spank a lover means that you wont be intimate for long