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1.
1. Something no one in their right mind will do without being told they have to.

2. A very popular word included to suck the fun out of any event.

3. Retarded and or ghey
1. These classes on safety are mandatory

2. Yay our company is having mandatory fun day.

3. I know you wont like staying late to sit in the office and do nothing 3 hours late for no reason at all but its mandatory.
by rooster210 May 29, 2013
 
2.
A brand of heroin once extremely popular on the lower east side of manhattan.
Also, by way of extension, anything that is particularly good or strong.
"What's good today? Mandatory"

"Damn that skunk was MANDATORY bro"
"Yeah"
by Jonathon_Holmes July 15, 2005