K-Y Jelly
noun [ U ] trademark uk/ˌkeɪ.waɪ ˈdʒel.i/ us/ˌkeɪ.waɪ ˈdʒel.i/
护肤胶冻;（尤指）性交润滑剂
a brand name for a transparent substance like jelly that can be put on part of the body in order to make the skin less dry and is also used during sex