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3.
Claiming one's spot on a couch by rubbing ones head back and forth on the occupants body. Ususlly used by homosexuals that are sooo gay!
What are you doing?
Dude Im burrowing!
Your sooo Gay!
by Chico Fil-A August 17, 2007
 
1.
Bizarre sexual gratification method involving making an incision in your partners thigh with a scalpel and making love to the wound
I totally burrowed that fat lass last night

my new boyfriend wants to get into burrowing but I'm a bit scared
by Orange Source December 28, 2009
 
2.
One step up from Nesting. This can include hardcore making out. This act is always done in public areas making everyone very uncomfortable.
Burrowing can lead to babies.
Are they nesting?...OH GOD!! They're BURROWING!!
by Holstein September 01, 2010