a boy who assists a clergy(priest) member in a church. They seem to be constanly molested by the priests.
Priest: Where is alter boy Joseph
Nun: I think he went to pray in the church.
Priest: Really, i shall join him
(enter suspensful music)
by Jessica Todero October 18, 2007
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A prepubescent male used by the clergy as a semen depository.
That alter boy is such a hard worker, old Father Seamus had virtually filled him to the brim.
by Cludgyspanklips October 31, 2019
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Sexual Act:
This is when your girlfriend gets behind with a strap on and fucks you up
the ass, while you jerk off. Then you kneel in front of her and suck the
dildo clean. You are so embarrassed by this act that you never speak of it
again and end up in therapy for years.
by Psychonaut May 7, 2003
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The man kneels and faces the women standing upward. After severe tounge action to the vagina the woman will release love juice in his face.
"Man, Me and Sheila were at it again last night and i gave her The Thirsty Alter-boy when she stood up to get dressed and it got really messy."

"You sure as hell better have showered after that one!"
by Johnny Dingman June 18, 2007
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The catholic-friendly version of "that's what she said." Used to change an innocent statement into a sexual bombshell.
*As your best friend's ice cream cones melts*

Friend 1: "Oh man, it's dripping all over my hands."

Friend 2: "Said the alter boy to the priest!"

Friend 1: "Ick!"
by Ecclese September 11, 2011
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term common among Catholic priest and used to describe the process of sodomizing a young acolyte as an initiation into the service of the priest and (and this is a purely incidental benefit) for the base sexual gratification of the priest.

the process of altering a young boys future by initiating him into homo-erotic behavior

what your uncle did to your cousin
Aunt Tittie: Cousin Johnny sure is an odd young man. He has so many nervous tics and habits.

Aunt Vaggie: What a shame and after Father Dicklicker spent soooo much time with him.

Aunt Tittie (light bulb above her head): Oh my, do you think Fr. Dicklicker was altering the boy?
by drpoonandtheteenangels August 28, 2009
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