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1.
Bottom - in BDSM terms to bottom is to be submissive to another - therefore bottoming would be to be submissive.
Kinks: Bottoming to men
by Marc9573 January 13, 2006
 
2.
Butt fucking....penetrating ones anus with ones penis

Not exclusive to the gay community
Bottoming is something gay men are widely know for, this is basically their main sex act or way of having sex
by cmar2cmar December 12, 2013
 
3.
(n) - bottomings consist of a mixture of sweets, usually with ice cream. Similar to toppings, but it is on the bottom.
Andrew likes to put nut bottomings in his ice cream.
by i dunno iono oreo April 18, 2010