A title of which someone who simps will buy the person they simp for gifts such as clothes, jewelry or other items they want, however they don't ask for anything back as making the person they simp for happy is payment enough; Someone who buys gifts for someone they simp for and either asks for nothing in return or says you can pay them in affection.
"I told my boyfriend to buy me a top that I liked as a joke but he actually went and got it for me along with some other things on my Amazon wishlist! When I said I owed him he said that I already repay him in affection."
".....Your boyfriend is a sugar simp omfg-"