Spelunk

[Sonia]

other forms: spelunking, spelunked, spelunks(v), spelunker (n)

v.;the exploration of natural caves
v.;the exploration of a mans anus by either: A. himself, B. a female sex partner., or C. male sex partner.

[Tina]

Exploration of bodily orifices.

[Marquetta]

1. Using your penis to explore a womans vagina, or cave.
2. To ejaculate.

[Kit]

(By analogy to exploring caves/other dark places)
To engage in casual internet stalking, usually out of curiousity rather than for any sinister purpose.

[Raeanne Dimick]

the act of getting farted on while giving someone anal...doesnt apply to homos

[Vania]

To take a dump - the sound of your poo splashing into the toilet water.