Can mean many things!
1. calm down
2. take a chill pill
3. have fun
5. u r too stuck up!
Serious Person: we shouldn't do this! it is too dangerous!
Person: momentine! and stop being serious bout everything!
Means basicly stop being stuck up and so protective!
1. cool down
2. stop being stuck up!
Stuck Up Person: we shouldn't be doing this shit!
Momentine Person: dude! momentine!