Webster’s definition of a sandbagger:
verb
1 :
to bank, stop up, or weight with sandbags
2
a :
to hit or stun with or as if with a sandbag
b :
to treat unfairly or harshly
c :
to coerce by crude means
d :
to conceal or misrepresent one’s true position, potential, or intent especially in order to take advantage of : to hide the truth about oneself so as to gain an advantage over another
My definition of a sandbagger:
CHEATER