Kiss is that thing for which the demand is always higher than the supply.
Kiss is a credit because it is profitable when returned.
Kiss is infinity because two divided by nothing.
Kiss is the shortest distance between two lips.
Kiss is the contraction of mouth due to the expansion of the heart.
Kiss is the reaction of the interaction between two hearts.
Kiss is the interchange of salivary bacteria.
Kiss is the juxtaposition of two orbicularisoris muscles in the state of contraction.
Kiss is infectious and antiseptic.
Kiss is an event whose probability depends on the vital statistics.
Kiss is the persecution for the child, ecstasy for the youth and homage for the old.
Kiss is a noun that is used as a conjunction; it is more common than proper; it is spoken in the plural and it is applicable to all.
Kiss is a process which builds a solid bond between the two dynamic objects
What is a kiss? It seems to be an undefined variable