to engage in acts of sexual nature. making out and and grabbing each other regardless of the person's sex or emotional attachments.
used in emo culture.

agasajarse y besarse, sin importancia de el sexo de los mimbros participando.
you wanna go mamasear? ok call some emo-buddies.

"voy a ir a mamasear"
"ok llama a unos cuates"
by polarbear253 September 7, 2008
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