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MDlb is a form of BDSM play or it can just be a type of role play. MD stands for Mommy Dom. lb stands for Little Boy. Mommy Dom Little Boy. The same way there is Daddy Dom Little Girl (DDLG) It's when a female acts as a Mother and her significant other acts as the little boy. This has nothing to do with actually wanting to date or have sexual relations with your son or mother. The mother role will feel empowered and protective over her "little boy" and the boy will feel like he can be released of any responsibility but giving up control is also very freeing. The mother role might also make rules that the "little boy" has to follow or it can resort to punishments depending on the agreement between the couple.

Any BDSM relationship should be safe and consensual.
Guy: I want you to act like a mother figure.

Girl: You want to do mdlb?
mdlb by Knk18 September 5, 2016
Related Words
MD mds MDF md 20/20 MDMA MDEC MDC mdr MDL MDM
mdlg is a type of b.d.s.m relationship (one between a dominant and submissive) the dominant being the i.e; "mommy" and the submissive being the i.e; "little girl" these terms are also found in relationships like: DDLG. mdlg is a relationship between two women, the little girl can also participate in age play meaning, acting an age younger or older than she really is to fit a role, pleasing the care taker, or "mommy" (these relationships can be either sexual or not.) These relationships aren't actually between a mother and daughter.
"Mommy can i have my paci?" Rosy asks quietly. "Yes babygirl." Lauren says happily, while shifting over to hand Rosy her pacifier. (this is an example of mdlg.)
mdlg by simplydelusional October 9, 2017
French equivelant of LOL, litterally meaning "mort de rire", "Death from laughter" or "dying of laughter" (though it should be note that most French people still know LOL)
mdr by hugo413 January 26, 2005
3,4-methylenedioxy-N-methylcathinone, AKA: methylone, bk MDMA, M1, is an is an entactogen of the phenethylamine, amphetamine, and cathinone classes. It was originally patented by Peyton Jacob and Alexander Shulgin in 1996 as an antidepressant . It resembles MDMA in its effects on the body and mind. Alexander Shulgin wrote "Methylone has almost the same potency as MDMA, but does not produce the same effects. It has an almost antidepressant action, pleasant and positive, but not the unique magic of MDMA".
bk MDMA by makeshift-piano August 12, 2011

OC3 optical line to MD5 Hash (#) 

A funny saying used by popular influencer, Ownage Pranks, to fool scammers.
I must check that the OC3 optical line to MD5 Hash (#) is working before I can give you my personal information.
Mdlg stands for mommy dom little girl. It is a relationship between two females, each playing their own role. A mommy is also known as a caregiver, someone who takes on a parent like role to a little. A little (little girl in this case) is a person who puts themselves into a younger mindset called little space. This relationship does not have to be sexual and it is not like a typical relationship. THIS IS NOT PEDOPHILIA.
I'm in a mdlg relationship and I love my mommy soooooo much.
Mdlg by Maxie96 May 10, 2018