Lemondries

When a female wearing white underwear inadequately wipes her vagina after taking a wee and pulls them up, once dry causes yellow discolouration of the gusset.

upon washing his partners pants lemondries were noticed in the gusset.

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Medallion

When a man inadequately shakes the drips off of his penis following urination causing his undergarments to adsorb the urine into an expansive dot causing a 'Medallion'

Can also be further classified as a 1 spot 2 spot or 3 spot. Any more than a 3 spot classifies one to have urinated themself.
For the female equivient

After going for a wee Anthonys friends noticed he had medallions on the front of his underpants.