A sick day that you take when you just don't feel like going to work or had too much to drink the night before.

The horror and shame of getting old; especially when approaching the age of gray hair and arthritis.

'To pull a sickie'
Taking time off work under the false pretence that you are sick, when really you just can't be arsed to go in. Sickies also often pulled when hungover or when you've run out of annual leave.

A derogatory term for a Mexican.

someone who always fakes sick to get out of something

Something that would be considered sick or tight.

1, to fake illness to avoid work
2, to knee a guy in the crotch (it makes you feel like barfing)