Definition of reel in in the Idioms Dictionary. reel in phrase. 1. to pull someone or something toward you We snagged the alligator near its tail and reeled it in. This Slang page is designed to explain what the meaning of reel in is. The slang word / phrase / acronym reel in means . Online Slang Dictionary. A list of slang. Meaning dont bother, calm down. "ah allow the beef man, just reel it in " " reel it in blood he aint worth it" " reel it in, i aint goin there thats missions away".