To be arrested or jumped. Any thing that may hold you up. An inconvenience may be refered to as a Hem Up.
Also to fix the hemline on the bottom of a dress or pair of pants. Shortenting a dress or pair of pants.
"Man, I got hemmed up last night, and pigs took the sack I just got!"
"These suckas hemmed me up and jacked my wallet and gold chain."
"Sorry I couldn't make it last night, I got all hemmed up at work, and didnt get out of there till midnight."
IN BRIEF: Caught, caught up, cornered, held up, trapped, etc.
They got my homey hemmed up and they all around
Ain't none of them seeing if they going straight pound for pound
I gotta come up real quick before they start to clown I best pull out my strap and lay them busters down
NATE DOGG, from the song "Regulate" with Warren G.