Basically, a 'ickup line' is somthing you would say to a guy/girl to get them to like you. Everyone has probably heard these from one point to another. Here is an example of a common one:
+ "somebody call heaven, because I think an angel has gone missing"
Basically, in this thread you would post some funny 'ickup lines' that you have heard/thought of. I'll give an example:
+ "I'm like choclate pudding. I look like crap, but I'm as sweet as can be."