Gay slang. Describes the phenomenon where the anal sphincter tightens reflexively and involuntarily in response to penetration, holding the inserted object tightly, often in the context of sexual play. Where the penetrator is using part of the body and receives an injury, this is referred to as being 'bitten'.
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!