jock itch 
noun [mass noun] North American informal
A fungal infection of the groin area.Ringworm of the groin is called tinea cruris or jock itch....
- Also called tinea cruris, jock itch is closely related to other skin conditions with similar names.
- There are several common superficial fungal infections and jock itch is one of them.
Origin
1970s: jock from jockstrap.
- be for it
- be for (or all for) the best
- be for the high jump
- befoul
- be fresh out of
- befriend
- be frightened of one's shadow
- be frightened (or scared) out of one's wits
- befuddle
- befuddlement
- be full bottle on
- be full of it
- be full of the joys of spring
- befurred
- beg
- begad
- began
- begat
- begemmed
- beget
- be/get carried away
- be/get liquored up
- begetter
- beggar
- beggar belief (or description)