look up any word, like queefing:
 
1.
When someone is bad at throwing a ball in sports.
"Nice throw, custard arm."

"What is Jono doing, he's got the biggest custard arm ever."
by Jono P. November 24, 2005
10 1
 
2.
Having fat arms, the fat usually hangs from the arm - the same as lunch lady arms
Man, check out that fat piece of shits custard arms
by pezzzzzz October 21, 2009
6 5