The act of reaching underneath another's armpits and interlocking one's hands behind the victims head...it is said that the name was given because Nelson Mandela himself gave many young juvenile delinquints Full Nelsons during his Boot Camp.
Nelson Mandela: "It's a full nelson...bitch is a pun"
Half Nelson= A normal bowel movement with limited impact to associated porcelain and surrounding stalls.
Full Nelson= A bowel movement in the like of the Mt St. Helens eruption. Usually impacts the entire restroom facility, including stall walls, porcelain, seat and sometimes the floor.
Affectionately named after a construction worker named Nelson.
Brian: Don't go into stall #2, I just had a Full Nelson. Those protein shakes are killing me.
John: Really I only had a Half Nelson this morning...
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Kurt "the fag" Angle gave the Undertaker a full nelson while looking at Gary Coleman gay porn