The act of simultaneously masturbating and crying your eyes out. This is usually due to depression and desire for sexual companionship. Although not necessary to fall under the category, some find it useful and economically efficient to use their tears has a substitute lubricant AKA slippery sauce.
My imaginary girlfriend died last night so I sadfapped till' the morrow.
by ThePowerBauer March 15, 2014
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When someone mistypes LMFAO off by one character on the right side of the keyboard, leading to :<FAP or a sadfap. Said repeat offenders may be referred to as sadfappers
"Two guys walk into a bar, you think the second would have seen it!"
":<FAP!"
"No need to sadfap all over the place dude..."
by pikaporeon July 21, 2014
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