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1.
A slimy, desperate, perverted old man who seeks younger, more vulnerable mates. A dirty, loser man. The male equivalent of a cougar.

In nature, elephant seals have harums, in which one alpha male denies all other males access to the group. The non-alpha males are known to chill around the group, waiting to mount any young seal who strays from the pack.
"Ewww, Betty! The elephant seal at 3 o'clock is totally checking you out!"
"OMG! Jane is dating a total elephant seal. He's old enough to be her great-grandfather."
by Elephant Seal Awareness July 19, 2009
 
2.
a fat girl who plays water polo and qualifies as a "polo hoe" and likes 10 different guys named mike
Angela is an elephant seal, because RIA said so.
by nicnac215 December 20, 2006