Sick

Used to describe an action that is perceived as comically undesirable.

Example 1)
Lauren: I accidentally kissed my date on the neck! He was leaning in, so I was in route for a kiss, but apparently he was going for a hug.

Amie: Ewe Laura! You're sick!

Example 2)

Pagina: (Trips and falls, stands up to try to brush it off and does an awkward jig in the process. Doesn't think anyone sees her)

Laurita: Siiick!

Pagina: Chuckles to herself.