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1.
The act of cunnilingus, or more colloquially to "go down on a woman" !
Person 1 : "What are you doing after work ?"
Person 2 : "I'm gonna go home, have a feed and a shower. Might grab the Mrs and "put the beard on" too !"
by Cpt. Kickass June 20, 2009
 
2.
To clamp your mouth securely over the bearded clam of ones lady friend
Fancy a pint,

No i'm going home to put the beard on
by Clive Pillowfriend August 16, 2007