Walrusing

[Little_Girl]

To [lay] about and [snuggle] with friends (knuffelvrienden), like walruses [on the beach].

[Gregory]

When performing oral sex on two penises at the same time, so it looks similar to when placing [chopsticks] in the mouth to [emulate] the appearance of a [walrus].

[Sarah]

[To walrus].

Making [the sound] of a [walrus].

[Britney]

The act of placing two pens, french fries or [chopsticks] in ones upper lip to [mimic] the appearance of [walrus tusks].

[Tracie Lynn]

(v.) - pounding two drinks of hard alcohol [straight to the face] (usually Jameson whiskey) at the same time, creating the illusion that you are a walrus with 2 [walrus tusks]
[Walrusing] typically leads to immediate sloppyness, belligerent behavior and rediculous antics until the walruser inevitably passes the fuck out.
Recently it has grew to be a tradition of certain subgroups within fraternities to require and/or highly encourage new members to participate in [walrusing] absurd amounts of hard liquor the night they join the group. Current members typically participate in walrusing as well, but not to the same extent as the new members.
Alternatively, walrus can be used in its verb form. (see example 2)

[Greta]

A sexual act, involving two [walrus tusks], peanut butter, and a [garden hose]. There appears to be a demonstrated potential for vaginal [implosion] during this act.