spare ground 

The perineum - the bit of flesh between a scrotum and arsehole that can't be seen by it's owner unless a camera phone is employed, or a mirror placed on the floor.
By wiping a clean finger on the spare gound and then sniffing it or placing it under his partner's nose, a man thus enables himself to check the current hygeine status of his genital area.

Timothy - "Here Brenda, have a sniff at my finger".
Brenda - "(Sniffs) What the fuck Timothy! Your finger smells like shite! What the fuck have you been doing?"
Timothy - "Nowt. I've just ran it up my spare ground to see if I could get away without going for a shower before I get Knighted at Buckingham Palace today".

spare ground by boyboyce September 4, 2009

snare the groundhog before your foundation is destroyed 

to legally take care of a problem before it's too late or before the problem gets worse

if you have a house and a groundhog living under your front porch, you better snare the groundhog before your foundation is destroyed. In this scenario, this phrase IMHO is therefore more than just friendly advice.

snare the groundhog before your foundation is destroyed by Uncle Dimma December 27, 2014