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pineapple motherfucker

Someone who beats sexual partner with a pineapple during sexual intercourse through back door and/or front door.
My ass is so sore from my pineapple motherfucker.

cheapass motherfucker 

Someone who expects everything for free/ a person unwilling to part with money for goods.
Dan was such a 'cheapass motherfucker' he wouldn't pay for the merchandise he received.
cheapass motherfucker by OblongOne September 7, 2016

English, motherfucker! 

Best line from Pulp Fiction.
English, motherfucker! Do- You- Speak- It?

im high as a motherfucker

im really,really,really stoned eg i have been smokin lots of weed and am felling the affects strongly
john sed"im high as a motherfucker"

Lying-ass Motherfucker Coefficient 

When dealing with a lying-ass motherfucker, the Lying-ass Motherfucker Coefficient (LAMC)is the multiplier (generally around .39) added to any numbers (such as income, number of recent sexual relations, cost of automobile, amount of alcohol consumed, length of prison sentence, etc) quoted by said lying-ass motherfucker, with the intent of approximating a truer estimate of the referenced events.

The actual value of the LAMC fluctuates depending on the relative purity of the lying-ass motherfucker in question and must be adjusted accordingly. A LAMC of .8 or .9 is only appropriate for a "part-time" or a "fly-by-night" lying-ass motherfucker, while a true, pathological lying-ass motherfucker often necessitates a .1 or even a .05!

Use a known quantity to assign a LAMC value to the lying-ass motherfuckers in your life. If, for instance, a lying ass motherfucker at your work claims he made a cool $120 in tips over the course of his shift when you spotted him pocketing a paltry $45, you can safely place his LAMC at .375, give or take a few hundredths.

Once a LAMC is established, it tends to remain fairly constant, varying only in cases of extreme mental excitement, anguish, or upheaval. Lying-ass motherfuckers who are manic drunks, for example, often require a lower LAMC value when they are on the sauce. Tears in the beer, however, can indicate that a higher value should be used ("in vino veritas" rings true, for depressive drunk lying-ass motherfuckers at least).

A final note: the LAMC only applies to numbers which the lying-ass motherfucker has motive to inflate (like the number of people it took to beat the shit out of him last night downtown). For instances where a lower number would seem "cooler" (such as the number of statuatory rape charges on his permanent record) a Reverse Lying-ass Motherfucker Coefficient (RLAMC) must be employed. The RLAMC will be covered in a later article.
Andrew: Man, Jacob was wasted when I came in last night! He said he drank a whole twelve pack when he was out with Tina!

Joe: Man, fuck that noise. You know that Jacob's Lying-ass Motherfucker Coefficient is a good .25 easy. He drank three beers, cried for a while, got Tina's voicemail, got ten other girls' voicemails, watched TV, and then passed out on the couch, which is where you found him when you came in.

Andrew: You're right, man. Dude's a lying-ass motherfucker. I don't know what I was thinking.

Hurt like a motherfucker 

When you get hurt so bad that the pain is equal to someone fucking your mother, usually used in past tense.
Guy 1:I got hit by a truck and broke my legs and right arm when I was young

Guy 2: Dam, that must have hurt like a motherfucker