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1.
When a person's stomach sticks out so far that it prevents the person from getting a squirrel tap.
Frank is so fat, his dick shield blocked my squirrel tap.
by Lord Christopher November 07, 2007
 
2.
A condom, rubber johnny, propylactic.
"I put a shield on my dick
To protect me from that HIV shit"
- Notorious B.I.G.

A dick shield, hence.
by Charlesm12345678 October 28, 2007