This is a phrase coined by C Haddon Chambers and it can be taken to mean either :-
1. The broad far-reaching power or influence of coincidence;
or
2. Things just happen;
Note: See also Shit Happens
Why is it that everything Malcolm does turns to rat shit?
That's because it's Malcolm, not even the long arm of coincidence.
Having the appearance of extra long arms when vexed; Stomping away heavily with arms down to ones sides.
Angela Long Arm Stomped away after getting yelled at by her mother for not putting the seafood salad away.
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When someone has money but is to tight to share it.
Noob: Hey Dude, Want to buy the next round of drinks
V-Rex: Nah, it's cool man i have not got enough money.
Noob: God, Such Short Arms, Long pockets.
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When two dudes interlock arms (like in a toast of sorts) and jerk themselves (not each other) off. The act is considered neither gay nor cheating.
No bruh. Tom didn't cheat on Cindy. Him and Bobby were totally just Long Island Strong Arming it after the big win in the locker room.
When one gets so excited, that they run and flail their arms like a helicopter.
"The cool kids make fun of me for my long flowy helicopter arms."
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An individual who can reach the pillow from across the room from the bed.
Oh, man. We got us Jimmy long arms over here.