Someone who assumes something, even if it is not true. An adjective that replaces assume or assumption. An assumptionist is used as an accusation.Is commonly used with such.
"Your such an assumptionist! Just 'cause I didn't do my homework that doesn't mean i'm lazy."
"What an assumptionist." "Why is she such an assumptionist? Just cause Im friends with him doesnt mean we're together."
Hym "If by 'making assumptions' you mean assuming intuitively appealing axioms and deducing propositions from these, then, yes. And, yes, I have noticed that he has been substantiating these propositions (which is tight). Muh brains is fucking huge dawg. That's where all the pressure comes from. It's just muh big ole grey matter bulging out of my brain cage. Like some too tight jeans trying to contain a fat boner. I going to have to go out and buy a wheelbarrow pretty soon just to carry this motherfucker around."