The act of grouping people you hate together as if they were all the same person; usually giving them all the same disparaging handle or slur.
"How is it that all you conservatives are racist nazis?"
"How is it all you progressives are communist pedophiles?"
"Would you both just stop Lump-Summing eachother?"
"How is it all you progressives are communist pedophiles?"
"Would you both just stop Lump-Summing eachother?"
by Muttemor September 3, 2022
Get the Lump-Summingmug. by DasWonton February 25, 2019
Get the One Summug. by coochiedestroyer1 April 9, 2023
Get the shoot summug. sum 41 - a band that dosnt care what anyone thinks about what they like to write about or how they play their music. A band who isnt afraid to change their music! a truly outstanding band who kicks major ass!
by shannon August 16, 2004
Get the sum 41mug. Person 1: "Hey look at that Sim-sum over there!"
Person 2: "Wow she really has confidence without a man!"
Person 2: "Wow she really has confidence without a man!"
by chinaforlife2233 November 28, 2012
Get the Sim-summug. 
A band like none other, a perfected excellence that cannot be matched, their sound perfected in every way will never be matched by any future band. their sound goes together perfectly deryck cone and broundsoud rippin it on their guitars and steve. they are a band, not to be exceeded by any others, a perfected excellence.
by kyle November 26, 2003
Get the sum 41mug.